ITEM NAME:4pcs ESP8266 Esp-01 Serial Wireless Wifi Transceiver Module For Compatible C8G3 4pcs ESP8266 Esp-01 Serial Wireless Wifi Transceiver Module For Compatible C8G3 Color:black ESP8266 is a highly integrated chip designed for the needs of a new connected world. It offers a complete and self-contained Wi-Fi networking solution, allowing it to either host the application or to offload all Wi-Fi networking functions from another application processor. Serial/UART baud rate: 115200 bps Input power: 3.3V I/O voltage tolerance: 3.6V Max Flash Memory Size: 1MB (8Mbit) WiFi security modes: WPA, WPA2 Material: metal Package Including 4 * ESP8266 Wifi Transceiver Module Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..ESP8266 is a highly integrated chip designed for the needs of a new connected world. 4 ESP8266 Wifi Transceiver Module. WiFi security modes: WPA, WPA2. Input power: 3.3V.