Supports Wi-Fi; Supports TCP UDP FTP can help you achieve smart home appliances; Working voltage: 3.3~5.5V; Working current: 25~400mA; Transmitting rate: 0~10dBm; Frequency: 2402~2480; Channels: 0~13; Network speed: 1~11 Mbps for 802.11b / 6~54Mbps for 802.11g; Safety certification: WEP-128 WPA-PSK (TKIP) WPA2-PSK (AES); Built-in application: DHCP client DNS client ARP ICMP ping FTP TELNET HTTP UDP TCP; Main chip RN-171: WIFLY GSX 802.11 b/g Wireless LAN module; Serial choose: choose digital port as RX / TX; Reset button: reset expansion board; Indicator: two indicators flash when disconnected; Connected: AP LED (D1)flash connect to TCP: LED steady on.