ATTENTION-GRABBING: Extremely loud 110dB alarm helps wake/alert homeowner or renter when vibration is detected, helping deter intruder and possibly notifying neighbors (audible up to 680-feet/205-meters away) USER-FRIENDLY & VERSATILE: Keep peace of mind with the 3 adjustable settings (off/alarm/chime); chime mode is ideal to alert you when children or guests are coming and going when you are at home; alarm mode features 30-second activation delay to prevent immediate false triggering, but sounds immediately when doorknob is touched anytime after the initial 30-second delay PERFECT FOR TRAVEL: Compact size makes this alarm perfect for home and travel. Feel safe wherever you go - use the alarm on entry doors, bedroom doors, houses, apartments, hotel rooms, or even dorm rooms EASY INSTALLATION: No wiring needed (requires 3xAAA batteries, not included); simply hang the alarm on the inside of your door handle - perfect for homes, apartments, dorm rooms, or travel! RELIABLE: Backed by over 45 years in the security industry and developed by the #1 pepper spray brand trusted by police and consumers worldwide.