Fangrui Product Details 80mhz High-speed Spi Interface Built-in Hardware Tcpip Protocol Stack, Users Hardly Need To Master Complex Network Protocol Knowledge Support Up To 8 Socket Connections Support , Udp, Icmp, Ipv4, , Igmp, Pppoe Protocols Integrated Data Link Layer, Physical Layer Support Power-down Wake-up Support High-speed Serial Peripheral Interface (spi Mode 0~3) Internal 32k Bytes Transceiver Buffer Embedded 10baset/100basetx Ethernet Physical Layer (phy) Support Auto-negotiation (10/100-based Full Duplex/half Duplex) Ip Fragmentation Is Not Supported 3.3v Working Voltage, I/o Signal Port 5v Withstand Voltage Led Status Display (full/half Duplex, Network Connection, Network Speed, Activity Status) Ultra-small Pin Package For Embedded Applications Provides Application Routines For C Product Features: Power Supply Mode: 3.3v External Power Supply, The Current Should Be 200ma Control Interface Form: 3.3v Ttl Level, Spi Interface; 2* Single Row Of Pins Colour: Green Material: Abs Size: 23 X 25 Mm Package Contents: 1 *