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 mind 4-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 need Multi-application - Light-weight and small alarm suitable for kinds of doors and (sliding doors/, hung doors/, crank doors/), cabinets, drawers, freezers, refrigerators... Perfect for home, house, garage, apartment, dorm room, RV, office, business store, warehouse, hotel, pool door Easy 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 battery LOW 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 battery Model: -SF19 Host size: 33x56x17mm magnetic stripe: 11x35x10mm Battery: contain 3 AG13 (or LR44) button batteries Battery life: standby for about 1 year Distance between host and magnetic stripe: Less than 1cm Alarm volume: 110dB Ambient humidity: Less than 80% Operating temperature: - 10 Celsius - 60 Celsius Storage temperature: - 20 Celsius - 70 Celsius Colour:White Material:ABS Package Contents: 1 x Alarm 1 x Magnetic strip Only 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.