?This security powered wired doorbell provides an extra security and convenience for your house and working place. The doorbell lets you know a person calling at your door before you open it. This excellent wired doorbell can be used at dwelling house£¬ working place£¬ and factory. Built-in anti-interference system£¬ it avoids false ringing and miscommunication. What&acute;s more£¬ it is easy to install£¬ even if you don&acute;t know any electronic know-how. It must be your ideal choice. Good helper for your security. Opportunity and tide wait for no man.                                    Features            Power functions£¬ it possesses hands freeHands free intercomHigh image definitionConvenient installationUltrathin wall - mounted designMany kinds of collocation methodsHigh security assurance                                                            Specifications            A.Indoor    <br>Power    DC15V    <br>Power Dissipation    Standby time: 40MA; working time: 450MA; AV input: 260MA    <br>Display Screen    7" (16: 9) mimic board    <br>Resolution    960 (W) x 480 (H) x RGB    <br>Visible Area    150 (W) x 80 (H) mm    <br>Luminance    200cd / m2    <br>Video Input    1Vp_p    <br>Automatic Power - off Time    When surveillance: 1minute; during intercom: 2 minutes    <br>Sensitivity of Receving    - 60dB    <br>Working Temperature    - 40¡æ- + 70¡æ    Ring    16 chord ring for choose    <br>Indoor Machine    23 x 15 x 2.6cm    <br>B.Outdoor    <br>Power    DC12V (directly provided by indoor machine)    <br>Power Dissipation    Working time: 2W    <br>Imaging Angle    Digonal: About90¡ã    <br>Light Source at Night    Infrared luminotron    <br>Working Temperature    - 10¡æ- + 55¡æ    Outdoor Machine    17.3 x 9.8 x 3cm    <br>Weight    4443g / 156.72oz (Package inluded)    <br>                                                            Package Includes            4 x Indoor Machine1 x OutDoor Machine4 x Charger (140cm)4 x Connect Cable (5M)1 x Fittings Bag1 x Manual