Shop - Reliance Technology Solution

All Departments

Accessories
Controllers
CPU
Docking Stations
Expansion Modules
Firewalls and Security Appliances
Graphic Cards
Memory – RAM
Modules
Power Supplies
Printers & Scanners
Routers

About Us
Contact
Shop
Request a Quote

About Us
Contact

Reliance Technology Solutions. All right reserved.

Welcome to Reliance Technology Solutions

About Us
Contact

SFP-OC48-IR1, Cisco OC-48/STM-16 Intermediate-Reach SFP Module

3 × 2.299,00 €

GLC-EX-SMD Cisco SFP (mini-GBIC) Transceiver Module - LC/PC

2 × 549,00 €

HTS541680J9SA00 HITACHI TRAVELSTAR 5K160 80GB sata Hard drive

2 × 75,00 €

Refurbished ASA5510-BUN-K9, Cisco ASA 5510 Firewall

2 × 2.000,00 €

GLC-SX-MM-RGD= Cisco Rugged SFP (Mini-GBIC) Transceiver Module

2 × 90,00 €

PWR-2KW-DC-V2 Cisco 2100-Watts DC Power Supply

1 × 2.289,00 €

GLC-BX-U Cisco 1000BASE-BX10 SFP Transceiver Module

5 × 379,00 €

SFP-OC3-MM, Cisco OC-3/STM-1 Pluggable Short-Reach Multimode

3 × 94,00 €

SFP-OC48-LR2, Cisco OC-48c/STM-16c SFP, Long Reach

2 × 845,00 €

461826-B21 HP 2GB DDR2 Fully Buffered FB ECC PC2-5300 Memory

2 × 91,00 €

WD5000BPKX WD 50PK 500GB Blue 7.2K RPM 2.5" 6GBPS Hard Drive

1 × 45,00 €

Refurbished CISCO805 Cisco 805 Router - 1 x 10Base-T LAN

1 × 260,00 €

GLC-FE-100FX-RGD, Cisco Rugged SFP FP Mini-GBIC Module

1 × 139,00 €

SFP-OC3-SR Cisco Small Form Factor Pluggable Transceiver

1 × 229,00 €

HX316C10FBK2/8 HyperX Fury Black 8GB (2 x 4GB) DDR3 SDRAM RAM

2 × 71,00 €

GLC-FE-100FX, Cisco 100B-FX SFP Module LC Multi-Mode

3 × 85,00 €

46C7499 IBM 8GB DDR3 Registered ECC PC3-8500 Server Memory

1 × 98,00 €

CMY16GX3M2A2400C11R Corsair Vengeance Pro 16GB (2x8GB) DDR3

2 × 215,00 €

QFX-SFP-8GFC-SW Juniper SFP (Mini-GBIC) Module 1 X Fiber Channel

2 × 902,00 €

SFP-OC48-SR, Cisco OC-48/STM-16 Short-Reach SFP Module

3 × 350,00 €

GLC-BX-D, Cisco 1000BASE-BX10 Downstream SFP Transceiver Module

1 × 199,00 €

DS-SFP-FC8G-SW, Cisco 8 GBPS Fibre Channel SFP+

1 × 99,00 €

Refurbished cisco1720-RF Cisco 1720 10/100Base-T Modular Router

1 × 35,00 €

Refurbished cisco1750-RFCisco 1750 10/100Mbps Ethernet

1 × 60,00 €

408854-B21 HP 8GB DDR2 Registered ECC PC2-5300 Server Memory

1 × 88,00 €

GLC-ZX-SM-RGD, Cisco Gigabit Ethernet SFP

2 × 299,00 €

Subtotal: 24.194,00 €

View cart Checkout

Welcome to Reliance Technology Solution

All Departments

Accessories
Controllers
CPU
Docking Stations
Expansion Modules
Firewalls and Security Appliances
Graphic Cards
Memory – RAM
Modules
Power Supplies
Printers & Scanners
Routers

About Us
Contact
Shop
Request a Quote

Only this weekend

Super Discount

Items on sale this week

Top picks this week. Up to 50% off the best selling products.

SFP-1GE-FE-E-T Juniper Network Gigabit Ethernet SFP Transceiver

SFP-1GE-FE-E-T Juniper Network Gigabit Ethernet SFP Transceiver

144,00 €

J9151E Hp Aruba 10g Sfp+ Lc Lr 10km Smf Transceiver

J9151E Hp Aruba 10g Sfp+ Lc Lr 10km Smf Transceiver

283,00 €

iSFP-10G-LR Alcatel-Lucent 10GBase-LR SFP+ Optical Transceiver

iSFP-10G-LR Alcatel-Lucent 10GBase-LR SFP+ Optical Transceiver

2.346,00 €

SFP-10G-SR Cisco 10Gbps 10GBase-SR Multi-mode Fiber 300m

SFP-10G-SR Cisco 10Gbps 10GBase-SR Multi-mode Fiber 300m

83,00 €

JH234A HP X242 40G QSFP+ to QSFP+ 1m DAC Cable QSFP+

JH234A HP X242 40G QSFP+ to QSFP+ 1m DAC Cable QSFP+

355,00 €

JD096C HP X240 10G SFP+ to SFP+ 1.2m Direct Attach Cable SFP+

JD096C HP X240 10G SFP+ to SFP+ 1.2m Direct Attach Cable SFP+

60,00 €

About Us
Contact

SFP-OC48-IR1, Cisco OC-48/STM-16 Intermediate-Reach SFP Module

3 × 2.299,00 €

GLC-EX-SMD Cisco SFP (mini-GBIC) Transceiver Module - LC/PC

2 × 549,00 €

HTS541680J9SA00 HITACHI TRAVELSTAR 5K160 80GB sata Hard drive

2 × 75,00 €

Refurbished ASA5510-BUN-K9, Cisco ASA 5510 Firewall

2 × 2.000,00 €

GLC-SX-MM-RGD= Cisco Rugged SFP (Mini-GBIC) Transceiver Module

2 × 90,00 €

PWR-2KW-DC-V2 Cisco 2100-Watts DC Power Supply

1 × 2.289,00 €

GLC-BX-U Cisco 1000BASE-BX10 SFP Transceiver Module

5 × 379,00 €

SFP-OC3-MM, Cisco OC-3/STM-1 Pluggable Short-Reach Multimode

3 × 94,00 €

SFP-OC48-LR2, Cisco OC-48c/STM-16c SFP, Long Reach

2 × 845,00 €

461826-B21 HP 2GB DDR2 Fully Buffered FB ECC PC2-5300 Memory

2 × 91,00 €

WD5000BPKX WD 50PK 500GB Blue 7.2K RPM 2.5" 6GBPS Hard Drive

1 × 45,00 €

Refurbished CISCO805 Cisco 805 Router - 1 x 10Base-T LAN

1 × 260,00 €

GLC-FE-100FX-RGD, Cisco Rugged SFP FP Mini-GBIC Module

1 × 139,00 €

SFP-OC3-SR Cisco Small Form Factor Pluggable Transceiver

1 × 229,00 €

HX316C10FBK2/8 HyperX Fury Black 8GB (2 x 4GB) DDR3 SDRAM RAM

2 × 71,00 €

GLC-FE-100FX, Cisco 100B-FX SFP Module LC Multi-Mode

3 × 85,00 €

46C7499 IBM 8GB DDR3 Registered ECC PC3-8500 Server Memory

1 × 98,00 €

CMY16GX3M2A2400C11R Corsair Vengeance Pro 16GB (2x8GB) DDR3

2 × 215,00 €

QFX-SFP-8GFC-SW Juniper SFP (Mini-GBIC) Module 1 X Fiber Channel

2 × 902,00 €

SFP-OC48-SR, Cisco OC-48/STM-16 Short-Reach SFP Module

3 × 350,00 €

GLC-BX-D, Cisco 1000BASE-BX10 Downstream SFP Transceiver Module

1 × 199,00 €

DS-SFP-FC8G-SW, Cisco 8 GBPS Fibre Channel SFP+

1 × 99,00 €

Refurbished cisco1720-RF Cisco 1720 10/100Base-T Modular Router

1 × 35,00 €

Refurbished cisco1750-RFCisco 1750 10/100Mbps Ethernet

1 × 60,00 €

408854-B21 HP 8GB DDR2 Registered ECC PC2-5300 Server Memory

1 × 88,00 €

GLC-ZX-SM-RGD, Cisco Gigabit Ethernet SFP

2 × 299,00 €

Subtotal: 24.194,00 €

View cart Checkout

Welcome to Reliance Technology Solution

Home
Shop

“461826-B21 HP 2GB DDR2 Fully Buffered FB ECC PC2-5300 Memory” has been added to your cart. View cart

Filter Products

Show:

Showing 1–16 of 223 resultsSorted by latest

Clear filters

J9151E Hp Aruba 10g Sfp+ Lc Lr 10km Smf Transceiver

Add to wishlist

J9151E Hp Aruba 10g Sfp+ Lc Lr 10km Smf Transceiver

283,00 € Add to cart

J9151e Overview

This single-mode transceiver has a data transfer rate of 10 Gbps, which improves data throughput. It uses the 10 GbE data link protocol to enhance connectivity. With a maximum data transfer distance of 10 km, the Aruba SFP+ transceiver helps improve network range. Built from tough materials, it provides durability.

SFP-DW59-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW59-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW59-80K-HP Overview

SFP-DW59-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW58-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW58-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW58-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW57-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW57-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW57-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW56-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW56-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW56-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW55-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW55-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW55-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW54-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW54-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW54-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW53-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW53-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW53-80K-HP Overview

HP Compatible SFP-DW53-80K-HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW52-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW52-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW52-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW51-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW51-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW51-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW50-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW50-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW50-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW49-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW49-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW49-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW48-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW48-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW48-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW47-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW47-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW47-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW46-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW46-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW46-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

SFP-DW45-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

Add to wishlist Compare

SFP-DW45-80K-HP HP 1000BASE-DWDM ITU 100GHz 80km SFP

0,00 € Add to cart

SFP-DW45-80K-HP Overview

HP 1000BASE-DWDM ITU 100GHz 80km SFP Transceiver

1
2
3
4
…
12
13
14

Filter Products

Archives

January 2025

Categories

Uncategorized

Product Categories

Accessories
- Cisco Accessories
- HPE Accessories
- Avaya Accessories
- Cables
  - Power Cables
  - Network Cables
- SUN Microsystems Accessories
- Juniper Accessories
Batteries
- HPE Batteries
Cameras
- Fortinet Cameras
Controllers
- Avaya Controllers
- IBM Controllers
CPU
- Intel CPU
- AMD CPU
- HPE CPU
- Lenovo CPU
- Dell CPU
- Cisco CPU
- IBM CPU
Data Tapes
- FujiFilm Data Tapes
- Maxell Data Tapes
- Quantum Data Tapes
- HPE Data Tapes
- Sony Data Tapes
- Dell Data Tapes
- Imation Data Tapes
- IBM Data Tapes
- TDK Data Tapes
- Verbatim Data Tapes
- Sun Microsystems Data Tapes
- BASF Data Tapes
- Tandberg Data Tapes
- Compaq Data Tapes
Docking Stations
- Dell Docking Stations
- HP Docking Stations
- Lenovo Docking Stations
Expansion Modules
- Cisco Expansion Modules
- HPE Expansion Modules
- Juniper Expansion Modules
- Avaya Expansion Modules
- Asus Expansion Modules
Firewalls and Security Appliances
- Cisco Firewalls
- Fortinet Firewalls
- Fortinet Security Token
- Juniper Gateway And Security Appliances
Graphic Cards
- Zotac Graphic Cards
- ASUS Graphic Cards
- Cisco Graphics Cards
- Dell Graphics Cards
- HPE Graphic Cards
- Gigabyte Graphic Cards
- Lenovo Graphic Cards
- IBM Graphic Cards
- Visiontek Graphic Cards
- PNY Technologies Graphic Cards
- EVGA Graphic Cards
- AMD Graphic Cards
- MSI Graphic Cards
Laptop Chargers & Adapters
- HP Laptop Chargers & Adapters
- Dell Laptop Chargers & Adapters
- Lenovo Laptop Chargers & Adapters
- Axiom Laptop Chargers & Adapters
License
- Avaya License
- Fortinet License
Memory - RAM
- Samsung Memory - RAM
- Crucial Memory - RAM
- G.Skill Memory - RAM
- Kingston Memory - RAM
- Corsair Memory - RAM
- HPE Memory - RAM
- IBM Memory - RAM
- Lenovo Memory - RAM
- Cisco Memory - RAM
- Lexmark Memory - RAM
- Dell Memory - RAM
- Hynix Memory - RAM
- Micron Memory - RAM
- Supermicro Memory - RAM
- Sun Microsystems Memory - RAM
- Axiom Memory - RAM
- HyperX Memory - RAM
- ADATA Memory - RAM
- Apacer Memory - RAM
- Avexir Memory - RAM
- Addon Memory - RAM
Modules
- Cisco Modules
- Juniper Modules
- HPE Modules
- Dell Modules
Monitors
- Asus Monitors
Motherboards
- Intel Motherboards
- ASRock Motherboards
- HPE Motherboards
- Supermicro Motherboards
- Asus Motherboards
- Dell Motherboards
Network Switches
- Cisco Network Switches
- Juniper Network Switches
- LinkSys Network Switches
- Cisco Fabric Extenders
- HPE Network Switches
- Fortinet Network Switches
Phones
- Avaya Phones
- Fortinet Phones
Power Supplies
- Cisco Power Supplies
- Juniper Power Supplies
- HPE Power Supplies
- APC Power Supplies
- IBM Power Supplies
- Dell Power Supplies
- Lenovo Power Supplies
Printers & Scanners
- Lexmark Printers & Scanners
- HP Printers & Scanners
- Epson Printers & Scanners
Refurbished
- Refurbished Servers
- Refurbished Routers
- Refurbished Network Switches
- Refurbished Wireless Devices
  - Cisco Refurbished Wireless Devices
- Refurbished Firewalls And Security Appliances
  - Cisco Refurbished Firewall And Security Appliances
- Refurbished Memory – RAM
- Refurbished Accessories
- Refurbished Expansion Modules
  - Cisco Refurbished Expansion Modules
  - Juniper Refurbished Expansion Modules
- Refurbished Transceivers
  - HPE Refurbished Transceivers
  - Cisco Refurbished Transceivers
- Refurbished Power Supplies
- Refurbished Storage Devices
- Refurbished Motherboards
- Refurbished Batteries
- Refurbished Controllers
  - Sun Microsystems Refurbished Controller
- Refurbished Data Tapes
  - IBM Refurbished Data Tapes
  - HPE Refurbished Data Tapes
- Refurbished Docking Stations
  - Lenovo Refurbished Docking Stations
  - Dell Refurbished Docking Stations
- Refurbished Cables
  - Refurbished Power Cables
Routers
- Cisco Routers
- Juniper Routers
- Linksys Routers
Servers
- HPE Servers
- IBM Servers
- Lenovo Servers
- Server Management
- Dell Servers
- Cisco Servers
Storage Devices
- Intel Storage Devices
- Seagate Storage Devices
- Samsung Storage Devices
- Crucial Storage Devices
- Toshiba Storage Devices
- Fujitsu Storage Devices
- Western Digital Storage Devices
- Hitachi Storage Devices
- Cisco Storage Devices
- HPE Storage Devices
- Lenovo Storage Devices
- Dell Storage Devices
- Corsair Storage Devices
- NetApp Storage Devices
- Ocz Storage Devices
- VisionTek Storage Devices
- IBM Storage Devices
- Kingston Storage Devices
- HGST Storage Devices
- SanDisk Storage Devices
- Micron Storage Devices
- Fortinet Storage Devices
- Sun Microsystems Storage Devices
- Raid Controllers And Accessories
- Axiom Storage Devices
- Buffalo Storage Devices
- Transcend Storage Devices
Transceivers
- HPE Transceivers
- Cisco Transceivers
- Juniper Transceivers
- Aruba Transceivers
- Fortinet Transceivers
- Paloalto Transceivers
- Finisar Transceivers
- Alcatel-Lucent Transceivers
- Brocade Transceivers
UPS
- APC
- APC Batteries
Voip Gateways
- Fortinet VoIP Gateways
Wireless Devices
- Cisco Wireless Devices
- LinkSys Wireless Devices
- NetGear Wireless Devices
- HPE Wireless Devices
- Fortinet Wireless Devices
- Juniper Wireless Devices

Filter by price

Min price Max price

Price: —

Product Status

In Stock
On Sale

Network Equipment Supplier

House# 08, Street Circonvallizone Pancalieri, Itlay Post Code: 10060
Call Us Landline:+390119734047
Mobile: +393205612074
Email: info@reliancetechsol.com

Search your Favorite Product

Company

About Us
Refund and Returns Policy
Terms and Conditions
Privacy Policy
Contact

Categories

Accessories
Storage Devices
CPU
Memory – RAM
Servers

Reliance Technology Solutions. All right reserved.

payment

Home
Filter
Search
Account

Shopping Cart

SFP-OC48-IR1, Cisco OC-48/STM-16 Intermediate-Reach SFP Module

3 × 2.299,00 €

GLC-EX-SMD Cisco SFP (mini-GBIC) Transceiver Module - LC/PC

2 × 549,00 €

HTS541680J9SA00 HITACHI TRAVELSTAR 5K160 80GB sata Hard drive

2 × 75,00 €

Refurbished ASA5510-BUN-K9, Cisco ASA 5510 Firewall

2 × 2.000,00 €

GLC-SX-MM-RGD= Cisco Rugged SFP (Mini-GBIC) Transceiver Module

2 × 90,00 €

PWR-2KW-DC-V2 Cisco 2100-Watts DC Power Supply

1 × 2.289,00 €

GLC-BX-U Cisco 1000BASE-BX10 SFP Transceiver Module

5 × 379,00 €

SFP-OC3-MM, Cisco OC-3/STM-1 Pluggable Short-Reach Multimode

3 × 94,00 €

SFP-OC48-LR2, Cisco OC-48c/STM-16c SFP, Long Reach

2 × 845,00 €

461826-B21 HP 2GB DDR2 Fully Buffered FB ECC PC2-5300 Memory

2 × 91,00 €

WD5000BPKX WD 50PK 500GB Blue 7.2K RPM 2.5" 6GBPS Hard Drive

1 × 45,00 €

Refurbished CISCO805 Cisco 805 Router - 1 x 10Base-T LAN

1 × 260,00 €

GLC-FE-100FX-RGD, Cisco Rugged SFP FP Mini-GBIC Module

1 × 139,00 €

SFP-OC3-SR Cisco Small Form Factor Pluggable Transceiver

1 × 229,00 €

HX316C10FBK2/8 HyperX Fury Black 8GB (2 x 4GB) DDR3 SDRAM RAM

2 × 71,00 €

GLC-FE-100FX, Cisco 100B-FX SFP Module LC Multi-Mode

3 × 85,00 €

46C7499 IBM 8GB DDR3 Registered ECC PC3-8500 Server Memory

1 × 98,00 €

CMY16GX3M2A2400C11R Corsair Vengeance Pro 16GB (2x8GB) DDR3

2 × 215,00 €

QFX-SFP-8GFC-SW Juniper SFP (Mini-GBIC) Module 1 X Fiber Channel

2 × 902,00 €

SFP-OC48-SR, Cisco OC-48/STM-16 Short-Reach SFP Module

3 × 350,00 €

GLC-BX-D, Cisco 1000BASE-BX10 Downstream SFP Transceiver Module

1 × 199,00 €

DS-SFP-FC8G-SW, Cisco 8 GBPS Fibre Channel SFP+

1 × 99,00 €

Refurbished cisco1720-RF Cisco 1720 10/100Base-T Modular Router

1 × 35,00 €

Refurbished cisco1750-RFCisco 1750 10/100Mbps Ethernet

1 × 60,00 €

408854-B21 HP 8GB DDR2 Registered ECC PC2-5300 Server Memory

1 × 88,00 €

GLC-ZX-SM-RGD, Cisco Gigabit Ethernet SFP

2 × 299,00 €

Subtotal: 24.194,00 €

View cart Checkout