Features
1. Omron 5V solid state relay (240V, 2A), output port with resistance-type fuse (240V, 2A)
2. Size: 57 x 55 x 25mm
3. Input power source: 5V DC (160MA)
4. Input Voltage of Control Signal: 0-2.5V (low level state), the relay will be on; 3-5V (high level state), the relay will be off.
5. Triggered at low level.

Input part
DC +: connected to positive power source (supply power according to the relay voltage)
DC -: connected to negative power source
CH1: 1-channel relay module signal triggering end (effective at low level)
CH2: 2-channel relay module signal triggering end (effective at low level)
CH3: 3-channel relay module signal triggering end (effective at low level)
CH4: 4-channel relay module signal triggering end (effective at low level)