Border Patrol Safety Beam
This electronic entrance monitoring device creates an invisible infra-red beam between the two units up to 20m apart. An alarm sounds if someone moves through the beam – i.e. alerting a carer if an elderly relative or young child has wandered from the bedroom at night, or has opened the front door during the day and may be heading into danger. Can also be used outdoors to deter intruders, whilst warning you of their presence. Comes complete with three volume level settings and is easy to install – no fixing required. Each unit uses 1 x 9v battery (not included).