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Magnetic sensor detects open of doors/windowsEach open triggers the device to give out alarm for about 20 secondsRadio frequency (433MHz) remote control operates the alarm through barriersThree operating channelsRemotes only operate main units with same channel selectedSecurity system no more a costly device for homesEffective operation distance of remote: five metersEasy installationSimply fix the device on door/window by attached two-side adhesive tapesNo drill or tools are neededProduct sizes:52 x 83 x 20mm (main unit)50 x 38 x 13 (remote)Batteries:3 x AAA (main unit)3 x LR44 (remote)Average alarm level: 105dB
