... Working current : 8mA 2.Working voltage : DC12V 4-channel wireless remote control switch with wireless transmitter KL-K400C Specification & user manualTechnical parameters: ... Jumper on S1 &S2→ Unlocking4. WiringOn the back of receiver board marks: K, G, and BK is normal open connectorG ... jumper is off position) press A on the transmitter, receiver A goes on 2 seconds, then goes off automatically, ...