Feature：1. 100% brand new snd high quality.2. One Magnetic Sensor can match with at most 8 remote controllers freely. 3. One remote controller could control several magnetic sensors;4. Excellent Home use product，Tiny and fashion;5. Volume: 110DB;6. Alarm and door bell function for your option;7. Low energy and long work time;8. Simple install;Specification:1. Voltage: 3V AAA*2pcs(not included)2. Stand-by Volume: 100μA3. Alarm volume: 30mA4. Frequency: 433MHZ5. Alarm response time: 200ms6. Stand-by time: 8-12 months7. Specifications of Remote control8. Voltage: 12 12V27A*1pcs9. Stand-by Volume: 1μA10. Working volume: 15MA11. Stand-by time: 8-24onths12. Remote control distance: 20mPackage Included:1 x Magnetic Sensor (batteries not included)1x remote control1x user manualNOTES:Please make sure the arrow of the magnetic align the Magnetic Stick， magnetic stick stripe on the right side of the magnetic sensor， when the door is closed， the distance between magnetic sensor and magnetic stick should less than10 mm.Only use in indoor， banned in outdoor use.Working environment temperature: -10 ~ 60 ° CWorking environment humidity: < 80%Storage temperature: -20 ° C - + 70 ° C Low pressure detection:1.When the battery is low， the LED of magnetic door will flashing once per second， prompt low， please replace the battery.2.Remote control lights flashing dimmed or remote distance becomes shorter， please replace the battery.