Today only. Newegg has the 4-Pack Rosewill RSHS-11001 Home Security Indoor / Window Alarm for $10 with free shipping. Features a 100-Decibel alarm, 4-5 month life per battery and an on/off switch.
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Alarm dB: Up to 100 dB (effective distance 1M) Battery: 2x AAA Battery Life: 4~5 hours during alarming, 4~6 month at stand-by mode Magnet Distance: 10~13 mm Operating Temperature: 0°C ~25 °C (32 °F~ 77°F)
Features:
Indoor Magnetic Window Alarm Magnetic-triggered window protection. Up to 100dB alarm sounds when magnetic contact is broken Easy access of On/Off switch on the side Easy to install - no wiring necessary 4pcs/pack
review: Pros: - Relatively inexpensive, especially since batteries are included
- Easy to setup, install
- Quite loud when triggered
- Good surprise value
Cons: - All-plastic construction
- Easy to circumvent
-- rip the device appart (see all-plastic construction above)
-- or just close the door/window