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Amazon offers the UltraPro Personal Security Window & Door Alarm for $3.79. That's its best-ever price. Shipping is free for Prime members. Buy Now at Amazon
Features
- 120dB alarm or chime alert when the magnetic contact is broken
- Side switch toggles between off, chime, and alarm modes
- Wireless design mounts with included double-sided tape
- Runs on four included LR44 batteries
- LED low-battery indicator and test button
