This module contains 2 relays, which is working at 5V while the Max current is 10A. There're led indicators on the board to show you the working status of the relays.
1. DC+: 5V input
2. DC-: Ground
3. IN1: INPUT of Relay1
4. IN2: INPUT of Relay2
5. NO1: Normal open of relay1
6. COM1: COM of relay1
7. NC1: Normal connected of relay1
8. NO2: Normal open of relay2
9. COM2: COM of relay2
10. NC1: Normal connected of relay2