describe 1) It has a compact, small and innovative design to provide you with complete safety, 2) It can be used for at least 1 year, avoiding the trouble of frequent battery replacement, 3) Loud alarm can effectively deter thieves, 4) Remote control, more convenient. easy to use and install, 5) Flexible options: if you need an extra remote for your family members or just as a spare. See More Remote Controls in Special Offers and Product Promotions. Specification: Working temperature: -10~60 Working humidity: less than 80% Storage temperature: -20~70 use illustrate: 1. Alarm and disarm: In the standby state, press the "unlock" button on the remote control once, and then the alarm will enter the protection alarm state after beeping 3 times. The LED blinks every three seconds. In the button alarm state, press "lock" once, and exit the alarm alarm state after a long beep. In this state, the alarm has no function other than a low battery indication. 2. Trigger the alarm: In the alarm state, the machine will alarm for 30 seconds when it detects the door is opened, and then alarm again after 15 seconds. If the door is still open, it will continue for 30 seconds until the door is closed or the alarm stops. You can stop the alarm by pressing the "Delete" button on the remote. 3. Emergency function: When encountering the "panic" button "break-in or other emergency, press" to trigger the alarm. This function works in all modes. 4. Doorbell function: Press the "doorbell" button in standby mode, the handset will make a "ding dong" sound If you need to add a farther controller, you can do the following: first take out the battery from the alarm, press and hold the "learn" button, Then put the battery into the alarm, and hear a "beep", indicating that the alarm is in learning mode, Then you press one of the other three buttons, the alarm goes off twice, and you can use the now-added remote.