This is Home Security Battery Powered Intelligent Wireless 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            Extend your home security system<br>No Wiring is required￡? Plug-and-Play<br>Keeps you aware of intruders or visitors anywhere around your home<br>Door chime trigger by motion<br>Don't miss a visitor / customer / friend / client<br>Suitable for Home￡? Office￡? Unit￡? shop￡? warehouse￡? shed￡? Garage etc<br>Wireless￡? effective alarming distance is up to 50FT<br>Avoid the line laying trouble and expenditure<br>                                                            Specifications                        Weight          98g        <br>          Power Supply          3 x 1.5v AA batteries (not included)        <br>          Three Settings          Music / Off / Voice        <br>              Size          3.94" x 2.56" x 1.42"        <br>                                                              Package Includes            1 x Home Security Battery Powered Intelligent Wireless Doorbell<br>