Wirefree Magnetic Door/Window Contact

Wirefree Magnetic Door/Window Contact An ideal addition for locations not easily covered by a PIR detector such as outdoor sheds & conservatories, as well as internal doorways . Add as many wirefree sensors as required to your system . Protects a door or window against unlawful entry . Transmitting range up to 40 metres . Battery lasts up to 3 years . Compatible with all AEI Security wirefree alarms . New 434MHz Version! This accessory is NOT compatible with any 418MHz AEI Alarm (including ALL alarms purchased before July 2004) .