Chip board ENC28J60-I/SO; The board 25MHZ crystal; The network interface board HR911105A; 3.3 V power supply pin; Size:56mmx34mm The inputs are 5 V tolerant. SPI Interface Clock Speed:up to 20 MHz; Buffer Size:8 KB; Operating Voltage:3.1V to 3.6V (3.3 V typical); It can be controlled by using the SPI interface,making it convenient solution for embedded systems; Fully Compatible with 10/100/1000Base-T Networks; Integrated MAC and 10Base-T PHY; Supports One 10Base-T Port with Automatic; Supports Full and Half-Duplex modes; Programmable Padding and CRC Generation; Package: 4pcs ENC28J60-I/SO HR911105A Ethernet LAN Network Module SPI Interface

Board size:56mm x 34mm/2.2Inchx1.33Inch. RJ45 connector HR911105A isolation transformer. Main Chip: ENC28J60-I/SO;Power supply:3.3V.