These Door & Window Alarms become an instant, cost-effective security solution for your home.  The device functions by sounding a piercing alarm when a door, window, etc. opens.  One half of the alarm contains a magnet and the other contains a sensor; when the “seal” between the two portions is broken (i.e., the magnet is moved away from the sensor), the alarm sounds. 

Specifications:

• Double-function device:
  a) door chime (ideal for shop, office, etc.)
  b) window and door alarm
• Alarm can be switched on by using a switch to effectively protect against intruder entry
• Ideal for home, office, garage, caravan, summer house, garden shed, etc.
• No wiring required
• Easy installation
• Power supply: 3¡ÁLR44 alkaline batteries
• Loudness level of the alarm: 105 dB
• Loudness level of the door chime: 80 dB
• Alarm Sound
• Chime Sound
• Includes (4) Instant Alarms