Numerous years of experience with Inertia Sensors have been combined with our advanced wireless platform to create an outstanding RF-Sensor/ Contact detector. It comes with magnetic contacts as standard - a non-sensor head option is also available. It has superb RF range in a compact housing. Two-way wireless communication Contains battery Magnetic contact Additional alarm & tamper terminals Available in white, grey & brown Resin protected electronics Battery: CR123A 3V Lithium Standby Current: 7?A Transmit Current: 40mA Temperature: -10 to +40°C Weight (inc. magnet): 85g Size: 122mm x 33mm x 33mm (main unit) Size: 77mm x 18mm x 11mm (magnet) EN 50131-2-6 Grade 2 Class II EN Grade 2 Environmental Class II