Here I recommend one from aHappyDeal Company, a professional company focus on this kind of product.
Brief Introduction of Single Tone Wireless Magnetic Sensor Door/Window Entry Alarm
Main Feature: - Gives an alarm if someone opens the door or the window
- Secure your doors, windows, and valuables
- Compact design, no wiring required
- High sensitivity can be used to protect people against stealing
- Ideal entry warning for homes, apartments, dorms, offices, and more!
- Easily mounted to windows or doors with included mounting tape
- Electronic Magnetic Sensor detects entry
- Alarm is activated when the two pieces are separated
- 90 dB to 105 dB loud, instant alarm
- Convenient on/off switch
- Powered by 3 x 1.5VLR44/AG13 button cell
... [Full description on aHappyDeal]
Supplied by aHappyDeal, Click Here to find the latest price.
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