features:<br />1. 100%  and high quality.<br />2. prevent the thief cut off power<br />3. if a sudden power outage (blackout)， the alarm will be sounded<br />4. alarm termination when power is restored(can also mute the on/off switch to terminate alarm)<br />5. when the sound is low，please replace the battery， if long time no to use， please remove the battery.<br />6. acoustic pressure: 120db <br />7. powered by: 9-volt 6f22 battery powered<br />8. size: 5.3 x 2.3 x 10cm<br />9. cable length: 105cm<br /><br />package:<br />1 x  security alarm