Features: 1. Onboard And Stable ESP07 Wifi Module, Large Capacity 4m BYTE Flash 2. The I/O Port Of The Wifi Module And The Uart Program Download Port Are All Lead Out To Facilitate Secondary Development; 3. Onboard Ac-Dc Switching Power Supply Module, The Power Supply Mode Supports Ac90-250V/DC 7-12V/Usb5V, Onboard 1 Channel 5V Relay, Output Switching Signal, Suitable For Controlling Loads With Working Voltage Within AC250V/DC30V 4. Onboard Wifi Module Reset Button, Onboard Power Indicator Light, 1 Programmable Led And Relay Indicator Light, 5. ESP07 Supports The Use Of Development Tools Such As Eclipse/for Arduinolde And Provides Reference Programs For The for Development Environment. Description: Product Name:Relay Module Board Size: About 80 x 50mm Material: PCB colour: As shown Package Contents: 1 x Relay Module 2 x 6Pin Double Row Of Pins 1 x 6Pin Single Row Of Pins 1 x Short Circuit Cap 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.