Features: 1. Onboard And Stable ESP07 Wifi Module, Large Capacity 4m Flash 2. The I/0 Port Of The Wifi Module And The Uart Program Download Port Are All Lead Out To Facilitate Secondary Development. 3. Onboard Wifi Module Reset Button 4. Esp07 Supports The Use Of Development Tools Such As Eclipse/for Arduinoide And Provides Reference Programs For The for Development Environment. 5. Onboard 2 Way 5V Relays, Output Switching Signals, Suitable For Controlling Loads With Working Voltage Within AC250V/DC 30V, Onboard Power Indicator Light, 1 Programmable Led And Relay Indicator Light Description: Product Name:Relay Module Board Size: About 78 x 47mm Material: PCB colour: As shown Package Contents: 1 x Relay Module 1 x 6Pin Double Row Pin 1 x 8Pin Single Row Of Pins 1 x 6Pin Single Row Of Pins 3 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.