Allows to use static relay to control 4-CH devices (each channel up to 8A 35V); Each channel has LED indicator safe and reliable; Compatible w/ Arduino UNO / Arduino Mega / Arduino Duemilanove / Arduino Leonardo/Seeeduino Lite / Seeeduino / Seeeduino Mega; Adopts high quality relay module; With NO / NC interface convenient to use. Voltage: 4.75~5.25V DC Current: 8~250mA Switching Voltage: Max. 35V DC Switching Current: Max. 8A Frequency: Typical: 1Hz Switching Power: Max.70W Relay Life: Min.100000 Cycle ESD contact discharge:+/-4KV ESD air discharge:+/-8 Make sure working voltage lower than DC 35V