Feature: 1. With 18 module functions, it can meet more application needs and is very practical. 2. The relay uses low‑level trigger, photoelectric isolation input, good performance. 3. Increase the anti‑reverse function of the power supply, the power supply will not damage the module. 4. Using high-quality power modules, the discrete power supply before replacing the system is more stable and reliable. 5. With wireless power saving function, users can set independently, easy to use. Specification: Item Type: Self‑Locking RelayMaterial: Plastic Time Range: 0.1-9999 seconds Size: Approx. 75 x 44 x 16mm / 3 x 1.7 x 0.6in Voltage: DC 12V Applications: Home lighting systems, remote control switches, remote control locks, smart home/home, automation, DC 12V LED light, fluorescent lights, 12V DC motors, fluorescent lights, automotive electronics, industrial automation and control Connection: Module Control Terminal: There are 3-wire interfaces, all interfaces are terminals DC+: 12V positive 2. DC-: The power supply is negative 3. CH1: Input detection interface Relay Output: 3-wire interface, all interfaces are terminals 1. NO: Normally open (before the relay is closed, this pin is not connected, after the relay is closed, the pin is shorted to COM) 2. COM: Relay common interface 3. NC: Normally closed (before the relay is closed, this pin is shorted to COM, after the relay is closed, the pin is not connected) . Package List: 1 x Self‑Locking Relay