Rosewill RSHS-11001 Home Security Indoor/Window Alarm, 4 Pack (Silver) The Rosewill RSHS-11001 will emit up to 100 dB alarm within 3.28 ft. (1 m) distance to stop anyone from entering your room and alert you to an attempted entry 4-6 months of stand-by battery life and 4-5 hours of alarming battery life bring your extended peace of mind and make it an ideal companion to the frequent travellers Alarm dB: Up to 100 dB (effective distance 1M) Battery: 2x AAA Magnetic-triggered window protection