SainSmart W5100 ARM STM32 Ethernet Module, Network Expansion Board for Arduino
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SainSmart
{"Brand": "SainSmart", "Item model number": "W5100", "Item Weight": "0.8 ounces", "Package Dimensions": "4.5 x 2.9 x 1.4 inches", "Manufacturer": "SainSmart", "Date First Available": "March 29, 2014"}