Fangrui Product Details Features: 1. Onboard And Stable Esp07 Wifi Module, Large Capacity 4m Byte 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.