433Mhz Universal Wireless Remote Control Switch DC 12V 4CH Relay Receiver Module
1 —KC1 Normal Closed of relay (NC). 2 —KC1 Common of relay (COM). 3 —KC1 Normal Open of relay (NO). 4 —KC3 Normal Closed of relay (NC). 5 —KC3 Common of relay (COM). 6 —KC3 Normal Open of relay (NO). 7 —KC2 Normal Closed of relay (NC).