1) It has a compact, small and innovative design, providing you with complete security,2) It can be used for at least 1 year, avoiding the trouble of changing the battery frequently,3)Loud alarm can effectively deter thieves,4)Remote control, more convenience. Easy to use and install,5) Flexible options: If you need extra remotes for your family member or just for spares.Features:Operating Temperature: -10 ~ 60Working humidity: less than 80%Storage temperature: -20 ~ 70Directions:1. Alarm and disalarm:In standby state, press the ""Unlock"" key on the remote once, then the alarm enters protection alert state after beep 3 times.LED flashes once every three seconds. In the button alert state, press ""Lock"" once, then the alarm output alert state after a long beep.In this state, the alarm has no function except low battery indication.2. Triggering an alarm:In the alert state, the machine will give an alarm for 30 seconds when detecting the door open, and will give an alarm again 15 seconds later, if the door is still open,A period of 30 seconds until the door closes or the alarm stops. You can stop the alarm by pressing ""remove"" button on the remote control.3. Emergency function:In the event that the "emergency" button "intrusion or other emergency, press" to trigger the alarm. This function is effective in all modes.4. Doorbell Function:When press the ""Doorbell"" button in standby status, the receiver will give ""Ding Dong"" beeps twice, remind people inside to open the door.Package List:1 * Door Sensor1 * Remote Control