What it does, is monitors it’s own battery and if there is a sudden drain on the battery, an alarm will sound, an the LED will light up.
A slow drain on the battery does not set off the unit – It will only pick up a sudden drain (as tends to happen on investigations), and if the battery gets too low a small LED will flash, indicating that it needs to be changed.
The case also has a belt clip so you can keep this on you while investigating.
It is believed that sudden battery drains on equipment are a result of spirits trying to gain energy, so this device has been designed in a bid to attempt to combat this issue.
LED colours are customisable (Default colour: Red).
Runs off a 9v battery.