Specification:
1. Dimensions: 55mm * 39mm * 18.5mm
2. Weight: 31g
3. PCB color: black
4. board around with four fixed screw holes, hole diameter 3.1mm, easy to install and fixed
5. Relay selection of high-quality loose relay, single-pole double-throw. A common end, a normally open end, a normally closed end
6. Optocoupler isolation, good anti-interference
7. Low level pull-in, high-level release. Pull the status indicator light, release the status indicator is off
8. VCC for the system power, JD_VCC for the relay power. Plug in the jumper cap
