Features:It will work with most standard security system. Pull out the antenna of the magnetic detecto: when the door or window is opened from the closed position， LED 1 will turn to red for 2 seconds， the magnetic detector will be triggered and will send alarming signal to the main unit. Indication of low battery: When the voltage of battery is less than 7.5V， LED 2 will straightly turn on redlight. At this time， you nee to immediately change the batterySpecifications:Launch Distance: 100 meters (open place) Operating Voltage: 12VOperating Frequency: 433MHz Encoding: Jump hat pinWorking conditions: temperature - 10 ℃ to 60 ℃， humidity is less than 95%Size:78x 35x 17(mm) / 3 x 1.4 x 0.6(inch )Oscillation resistance jump cap optionsPower supply: Battery (12V DC included)Package Includes:5*wireless door sensor(Battery including)