Fangrui Product Details 1. Onboard And Stable Esp-12f Wifi Module, Large Capacity 4m Byte Flash; 2. The I/o Port Of The Wifi Module And The Uart Program Download Port Are All Led Out To Facilitate Secondary Development; 3. Onboard Wifi Module Reset Button; 4. Esp-12f Supports Development Tools Such As Eclipse/for Ide; 5. Onboard 2 5v Relays, Output Switch Signal, Suitable For Controlling The Working Voltage Of Ac Load Within 250v/dc30v; 6. Onboard Power Indicator, 1 Programmable Led And Relay Indicator. Type: Logic Ics Model Number: Esp8266 Esp-12f Wifi Relay Module Application: Computer Operating Temperature: Esp8266 Esp-12f Wifi Relay Module Supply Voltage: 5v/8-80v Colour:green Material:plastic Size: 78 X 47mm Package Contents: 1 X Relay Switch Board 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.