Features: 1. Onboard And Stable Esp07 Wifi Module, Large Capacity 4m Flash 2. Power Supply Mode Supports Dc7-28v/5v 3. Onboard Wifi Module Reset Button 4. Esp07 Supports The Use Of Development Tools Such As Eclipse/for Arduinoide And Provides for Development Reference Procedures In The Environment 5. Onboard 8-Channel 5v Relays Output Switching Signals, Suitable For Controlling The Working Voltage Of Loads Within Ac250v/Dc30v, Onboard Power Indicator Light And Relay Indicator Light. Description: Product Name:Relay Module Material: PCB colour: As shown Package Contents: 1 x Relay Module 1 x 8pin 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.