The Flashing Doorbell with Vibrating Pager is ideal for alerting the hard of hearing when someone is at the door.Easy to install with no wiring, the system has a range of up to 250 metres. Pushing the doorbell activates the mains powered flashing chime and portable pager. There is a choice of four volume levels and 52 melodies to help grab the user\'s attention. The pager requires 2 x AAA batteries (not included), and the bell push comes with a 23A, 12v battery.