Normally, it´s installed outside of the wall. It can be powered by the home alarm panel or the waterproof flashing siren. Even in the evening, the word ALARM on the board still can be very easy to see.
If anyone intruded into the detected area, it will send signal to the alarm panel that will auto dial your phone number to inform you. At the same time, the outdoor siren will also sound with high DB to scare away the intruder.
With this Electronic alarm board outside your house, it can protect your house properly from being intruding. Anyone who saw this guarding board that will know you own one burglar alarm system in your house. Then, the intruder might only choose the one who don´t have alarm system. It can be widely used to the house, villa, farm, etc.
