500 Ft Working Range: When a door or window is opened, the buzzer will instantly play the ringing alarm of your choice. Up to 500 feet of wireless connectivity in open areas, ideal for home front door, office or store. Easy Installation: The receiver is plug-and-play with no wiring required! Easily mount the sensor with screws or double-sided tape. Secure the sensor by attaching double sided tape to the sensor and placing it on the door/window. Great for business entrances, office entrances, or store fronts! 5 Levels of Volume: Adjustable loudness (1-5 levels of volume). Maximum 110DB, suitable for noisy stores, classrooms; support switching mute mode, can be muted in the conference room or sleep. 51 Tones: Choose from 51 wireless door chimes (short/long tunes, buzzer alerts) for business/home entry notifications. Personalize ringtones to match shops, offices, or home security styles. Multi-Scene Use for Doors/Windows: Sensor powered by 1 AAA batteries (included);Compatible with shop entrances, office doors, bedroom windows, classrooms.