Sealed cylindrical reed proximity switch unit from Comus designed to be recessed into door or window frames. * Sealed magnetic reed switch unit with 4 wire, 2 anti-tamper and matching magnet * ABS housing suitable for wooden or aluminium frames * 260mm flying leads * 12mm sensing range * 48V AC switching voltage * 0.5A switching current * 10VA switching capacity * Normally open contacts * 200mR contact resistance * Sold as a set