- Creates an invisible alarm barrier in seconds
- 20m 75ft range
- 3-mode sounder
- chime continuous chime & siren & 3 volume settings
- Extremely simple to set up Switch on the transmitter line up the receiver up to 20m away & switch on. The receiver will sound whenever the invisible infra-red beam is broken. It can be set to chime once or chime continuously with volume adjustable to low medium or high or set to a continuous high level siren. Each pair features a coded infrared transmission & a switch for high or low power output. Both of the units require three AA batteries or a 6V plug-in mains adaptor each sold separately.