1. Power Supply: 5V DC (160MA)
2. The Input Control Signal Voltage: (0-2.5V Low State Relays ON) (3.3-5V State High Relay OFF)
3. DC +: Positive Power supply (by Relay Voltage Power Supply)
4. DC -: Connect Power Negative
5. CH1: 1 Signal to Trigger the end of the Relay Module (High Level Trigger Valid)