Technical information
1. DC Power supply 12 V.
2. You can adjust the sensitivity of MIC By adjusting the VR1
3. Timer can be set from 0 to 3 minutes Estimated by adjusting the VR2.
4. There LED1 display When relay.
5. Reverse Polarity Protection.
6. Dimension 4.67 cm X 6.5 cm (1.84" X 2.56").