Features 1、Better Control: Comes with stable USB to serial port chip and micro controller to control the 1 channel relay on and off. 2、Working Safety: Also has over current protection and relay diode freewheeling protection to ensure safe and stable working. 3、Premium Design: On board 5V, 10A 250VAC, 10A 30VDC relay for a service life to be continuously pulled in 100,000 times. 4、Simple in Work: Equipped with on board HID control chip, this driver free relay module is easy to use, just plug and play. 5、Easy to Install: Compact in size and light in weight as well, all the 5pcs relay controller is very convenient to install. Specification Item Type: Relay Module Material: PCB copper plate. Package List 5 x Relay Module