Features110dB 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 or windows hung doors or windows crank doors or windows) cabinets drawers freezers refrigerators... Perfect for home house garage apartment dorm room RV office business store warehouse hotel pool doorEasy to install and use - simple peel and paste . No wiring no screws. For indoor use only. Press the on or off switch to turn the power on or 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 DuDu sounds every half hour to remind you to replace batterySpecificationsModel: KS-SF19Material: ABS materialHost size: 33x56x17mm magnetic stripe: 11x35x10mmBattery: contain 3 AG13 (or LR44) button batteriesBattery life: standby for about 1 yearDistance between host and magnetic stripe: 1cmAlarm volume: 110dBAmbient humidity: 80 percent Operating temperature: - 10 - 60 Storage temperature: - 20 - 70 Origin:CN(Origin) Smart home platform:NONE Alarm Type:The Alarm Power:LR44 button battery Video Interface:No Display:No Certification:CE Kit Configuration:Door or Window Sensor Password Keyboard:No Door Sensor Feature1:Security Alarm Door Sensor Feature2:Wireless Door Sensor Door Sensor Feature3:Door Open Detectors Door Sensor Feature4:Security Protection Alert Door Sensor Feature5:Wireless Home Alarm Door Sensor Feature6:Security Door Sensor Feature7:Alarm Systems Security Home Door Sensor Feature8:Door And window Alarm Door Sensor Feature9:Refrigerator Freezers Alarm