SECRUI Door Chime, Door Chimes When Door Opens with Adjustable Volumes, Easy Installation, 52 Chimes, 400ft Wireless Range, M508+D7 Door Sensor Chime for Business Store Home, Black

Entry Alert Chime: This doorbell chime will alert you when the two-part door sensors are separated. And the door sensor is small in size and can be installed or placed at any position. So it's a good choice to protect your home/apartment/office etc.
5 Volume & 52 Ringtones: This door and window alarm includes 5 level volume adjustable(0-110 dB) and 52 ringtones chosen. You can also choose a specific chime and adjust the volume, which can be ideal if you want to set a different tone for each door and window. Besides, the LED indicator is helpful for the elderly and hearing impaired.
Long-Distance and Expandable: The distance between the door sensor and door chime can be up to 400ft. And you can place additional receivers in various locations around the house so a ring is never missed.
Memory Function: This door open sensor will remember your previous tones when you re-plug the receiver or if you must change the battery when the door sensor was out of power. No need to reset the ringtones once again.
Easy to Install: Just plug the receiver in a standard outlet, tear the double-sided adhesive tape of the door/window sensor and stick them to any door or window. Then you can use it.