108dB Time-delayed Door Reminder Magnetic Sensor Personal Door and Window Anti-thief Securirty Alarm Burglar Alarm system

* Easy to install and requires no wiring
* Real 108-decibel loud alarm sounds
* Window/door alarms feature easy access off/chime/alarm switch
* Special door remaining open alert function
* Low battery led indicator
* All mounting adhesive pads included
* Energy-saving, over 24 months battery life*Enter delay setting: set the delay time based on your use and operation of proficiency.4 stages of time delayed adjustment ,3s,15s,30s,60s for option .

Applications:
For the alarm has many functions, you should buy it for many reasons. the doorbell function will reminder you when the customer is coming in shops, in cafe, in restaurant; the alarm function will drive away the thief when he is trying to open the door window in anyone's house,warehouse.You can put our alarm anywhere if you want a notice when any door or window is open!