This is a bistable (self-locking) relay module,Trigger once, the relay pull (and holds);Trigger again, the relay releases (and holds). Description: Working voltage: DC 6-24V Working current: 60-70MA Standby current: 1UA Load current : AC 250V/10A, DC 30V/10A Trigger mode: Low pulse trigger Module interface: 1. VCC: positive power supply (VCC) 2. GND: negative power supply (GND) 3. T : Low pulse trigger Relay outputs: 1. NO: normally open relay interface 2. COM: Common Interface Relays 3. NC: normally closed relay interface USE : By default, the relay is release, the trigger button, the relay pull, again, the relay release, the third , the relay pull, and so on Typical applications: Automotive electronics Industrial equipment Motor LED Smart Home Emergency lighting MCU development board Toy car Color: Green Material: PCB+Components Package Contents: 1*1 Channel DC 6-24V Self-locking Relay Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.