Battery Operated Wireless Doorbell:Wireless doorbell does not need a socket, just 3 AAA batteries (included).This wireless doorbell has an effective working range of 1000 feet in open areas, you will never miss a visit.

Hearing Impaired Doorbell:This wireless doorbell chime has colorful flashing LED light and Vibrating function, and the receiver has a back-clip ,it can be carry anywhere or place on the desk you need it. This is a Flsahing+Vibrating+Ringing doorbell for the hearing impaired.

Portable Doorbell Receiver:Wireless doorbell has mute mode.This wireless Door bell ringer has 4 Working Modes(A/B/C/D),4 simple ringtone options and 5-level volume selection (0DB-30DB-60DB-90DB-110DB).

Easy To Install and Use:Use the double-sided tape or the screws (included) to mount the doorbell push button,install the receiver's 3 AAA batteries (included) and press and hold the round ON/OFF button to turn on the receiver,then you can use it normaly.

Satisfactory After-Sales Service: Amazon Logistics is our partner, we can quickly deliver the package to your home within 1-2 days, we provide a 30-day refund service.If there are quality problems with the sanjie door chimes, please feel free to contact us. So as to give you the best shopping and using experience.