110dB LOUD ALARM- 110 decibel loud alarm goes off when door or window opens and it will not stop even the door closed, effectively helps deter intruder and alert residence. The window sensors will give you peace of mind4-in-1 MODE- 1. General Alarm (alarm stop if door closed); 2. Constant Alarm (constant alarm even door closed); 3. Closing-door Alert (sound "Di..Di" from 0dB to 110dB); 4. Door Open Chime (sounds "DingDong" once if door opens), super easy to set the mode according to your needMulti-application - Light-weight and small alarm suitable for kinds of doors and windows (sliding doors/windows, hung doors/windows, crank doors/windows), cabinets, drawers, freezers, refrigerators... Perfect , house, garage, apartment, dorm room, RV, office, business store, warehouse, hotel, pool doorEasy to install and use - simple peel and paste installation. No wiring, no screws. For indoor use only. Press the on / off switch to turn the power on / off. Each alarm is equipped with LR44 batteryLOW BATTERY INDICATOR - The battery operated window alarms with low consumption, battery can last up to one year. And it have low battery indicator, "" sounds every half hour to remind you to replace batteryModel: -SF19Host size: 33x56x17mm magnetic stripe: 11x35x10mmBattery: contain 3 AG13 (or LR44) button batteriesBattery life: standby for about 1 yearDistance between host and magnetic stripe: Less than 1cmAlarm volume: 110dBAmbient humidity: Less than 80%Operating temperature: - 10 Celsius - 60 CelsiusStorage temperature: - 20 Celsius - 70 CelsiusColour:WhiteMaterial:ABSPackage Contents:1 x Alarm1 x Magnetic stripOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.