?This is 9510FD3 Mini Home Security Digital Wireless Electronic Doorbell. Doorbell chimes provides an extra security and convenience for you and your family£¬ you can put this Doorbell to any places of your room. This Wireless Doorbell is excellent for being used at home£¬ office£¬ shop or any places need to welcome the guests or the customers. Built-in anti-interference system£¬ avoid false ringing and miscommunication among different users. Your ideal choice!                                    Features            You can install the doorbells in locations£¬ such as kitchen£¬ back yard£¬ bedroom£¬ etc. never miss the guestWith double side stickers at the back side of the remote button£¬ very easy to installThe special and pleasant of the doorbell has several bell sound include for all people to chooseWireless easy mounting design never affects your inner decoration and makes the doorbell anywhere you likeAll day long anti-interference system£¬pretends the doorbell from interferences outside or between neighborsEnergy saving design of environment protection£¬ the battery inside the button can last for one year (20 presses per day)Powered by 2 x AA size batteries for the door bell£¬ (but not included) and 1 x 12V type 23A battery for the remote button                                                            Specifications            Power supply    2 x AA batteries (not included)    <br>Door bell size    3.74" x 2.56" x 0.39"    <br>Remote button size    3.15" x 2.76" x 0.59"    <br>Color    Mainly White    <br>Weight    223g / 7.87oz    <br>                                                            Package Includes            2 x 9510FD3 Mini Home Security Digital Wireless Electronic Doorbell1 x Power Switch1 x 23A 12V Battery