Our Fence Voltage Alarms warn you when the voltage on your fence is falling short of the preset level. Connecting the hooter provided with the system can expand its range up to 1 km. Monitors the effective voltage in your fence Alarm activates once the fence voltage falls short of the preset level It goes off once the fault is cleared It has a built in piezo buzzer audible for a room Connecting the hooter provided with the system can expand its range up to 1 km