... 2 Product name: 8-channel wireless controller/wireless remote switch system1.3 Working Voltage: DC12V(6V,9V,12V, ... -lock ,self-locking)The 8P on the PCB board all are the match setting.Notice: link it ... block → no lock4 On the back of receiver board marks : K, G, BK is the relay ... normal closed connector.5. Applications8-Channel Wireless Remote Control SwitchRemotely control a multitude of systems around ...