Compact batterypowered vibration alarm designed for doors and windows that warns of sudden movement and deters unauthorized entry. Key features and benefits Three adjustable sensitivity settings let you tune the device for different mounting locations and reduce false alarms while keeping detection reliable. Fast response: activates within 0.5 seconds of detected movement to provide immediate warning. Practical slide switch lets you turn the alarm off quickly when needed without removing batteries. Battery operated: requires 3 1.5 V batteries, not included, for flexible placement where mains power is not available. Durable plastic construction keeps the unit lightweight and unobtrusive while remaining sturdy for everyday use. Loud, piercing alarm provides a clear audible warning to deter potential intruders and alert occupants. How it solves common problems Detects vibration and tampering at entry points before an intruder can gain access. Adjustable sensitivity helps avoid nuisance triggers from nearby traffic or routine household activity. Battery operation and compact design allow installation in locations where wired systems are impractical. Function, compatibility and performance Function: vibrationtriggered audible alarm with selectable sensitivity levels and an off slide switch. Compatibility: suitable for most doors and windows, including sliding patio doors and secondary entrances where vibration or manipulation may occur. Size and material: compact plastic housing fits discreetly on frames and sills without adding bulk. Performance: rapid activation within 0.5 seconds to provide timely audible deterrence. Practical use scenarios Homeowner: mount on a rear patio door to warn of attempts to force or jiggle the lock during nighttime hours. Renter: place on a bedroom window while away to provide an extra audible alert without modifying the window or frame. Garage owner: attach near the garage entrance to detect sudden vibrations from prying or impact. What to know before you Requires three 1.5 V batteries, not included. Intended as a local audible deterrent and alert; ideal as a simple supplementary layer of protection for doors and windows.