1 Dimensions: 50.5mm (length) * 38.5mm
(W) * 18.5 (H)
2 Weight:. 31g
3.PCB Color: Black
4 board four weeks with four screws holes,
hole diameter 3.1mm, easy to install and fixed
5 relay of high quality loose music relays SPDT.
A common terminal, a normally open, one
normally closed terminal
6 optocoupler isolation, good anti-jamming
7 low pull, high release. Energisation status
indicator light, release status LED is off
8.VCC of system power, JD_VCC relay power.
You can plug in jumpers