The Hampton Bay Wireless Plug-In Door Bell Alert Kit lets you know when a door has been opened. Use the sensor on a standard door, sliding door, cabinet, or window. All Hampton Bay Wireless Push Buttons, Door Bells, and Alerts are compatible, so you can add other products to your home system to fit your needs. Syncs with all Hampton Bay Brand and Heath Zenith Brand Push Button Adjustable volume control 3 selectable tunes: Westminster, ding-dong and ding Beep-beep alert for door sensor Up to 150 ft. transmission range