KEYESTUDIO 4-Channel 5V Relay for Arduino Uno R3 Mega 2560/ Raspberry Pi/Avr/STM 32 KEYESTUDIO Relay Shield employs high quality relay with four channels input and four channels output. Connected to 250V/10A AC element or 24V/10A DC element to the maximum It can be used to control lights, motors and etc The modularized design makes it easy to connect to Arduino expansion board. The output state of the relay is shown by a LED for the convenience of actual application We provide Sample Code, wiki tutorial and video for arduino user, just scan the QR code on the picture to get Control signal: TTL voltage Rated load: Rated Through-current: 10A(NO) 5A(NC) Max Switching Voltage: 250VAC 30VDC Contact actuation time: 10ms Definition of module pins: