1) Ultra-small size; 2) Serial port to WiFi; 3) Wireless transparent transmission; 4) Ultra-low power consumption over long distance; 5) External antenna can be connected. Powerful functions, running LWIP protocol internally Support three modes: AP, STA, AP+STA coexistence mode Perfect, concise and efficient AT commands, making your development easier. High temperature resistance, up to 125 Fully compatible with ESP8266, code can be transplanted and used intact. Colour:As Shown Material:PCB Package Contents: 10 x Wireless Module Only the above package content, other products are not included. Note: Light reflection 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.