?Highly advanced technology has infused into this 3.5" One-to-Two Color Display Wireless Video Door Phone Doorbell Black &amp; White. If you happen to seek for a wonderful visible visual doorbell£¬ you¡¯d better attach importance to this item. Composed of an outdoor doorbell camera and two indoor color monitors£¬ this set enables you to communicate with people outside through intercom system without opening the door personally. When the doorbell is rung£¬ the picture of visitors will automatically appear on the display. Featured with wireless function£¬ this video doorbell guarantees your security and convenience at the same time. Your great choice!                                    Features            One-in-two peephole video with door bellHands free video door phone3.5" color monitor with ultra-slim design and full-touch screen£¬ nice and luxuriousIt is easy to install by yourselfBuilt-in high-capacity rechargeable lithium battery (BL-5J)Clear night vision can capture image in low-illumination environmentMonitoring outside by pressing the keyImage brightness£¬ color and volume can be adjustedNo radiation£¬ low consumption and high resolutionSupporting embedded and hanging installationIt provides an extra security and convenience for you and your family                                                            Specifications            Indoor Unit Dimensions    (14.1 x 8.7 x 2) cm / (5.55 x 3.43 x 0.79) " (L x W x H)    <br>Outdoor Unit Dimensions    (6.5 x 5 x 8.7) cm / (2.56 x 1.97 x 3.43) " (L x W x H)    <br>Working Distance    Approx 200m    <br>Weight    818 g / 28.85 oz    <br>Color    Black &amp; White    <br>Working Temperature    - 20 degree - + 50 degree    <br>Working Humidity    Less than 85%    <br>Outdoor Camera         <br>Working Rate    2402~2483.5MHz    <br>Transmitting Power    18~23dBM    <br>Camera    1 / 4" CMOS    <br>Working Current    300mA    <br>Standby Current    20~30mA    <br>Battery    Rechargeable lithium battery (BL - 5J)    <br>Battery Capacity    1350mah    <br>Standby Time    2 month    <br>Adapter Input    AC100~240V£¬ 50 / 60Hz    <br>Adapter Output    DC5V / 1A    <br>Applying Peephole Diameter of Door    14 to 40mm; Thickness: 40 to 100mm    <br>Indoor Monitor         <br>Screen    3.5" TFT LCD£¬ 320 X 240 pixels    <br>Sensitivity    90dBm    <br>Working Current    250mA    <br>Standby Current    20 - 30mA / 3.7V    <br>Battery    Rechargeable lithium battery (BL - 5G)    <br>Battery Capacity    1350mah    <br>Standby Time    120h    <br>Adapter Input    AC100~240V£¬ 50 / 60Hz    <br>Adapter Output    DC5V / 1A    <br>                                                            Package Includes            2 x 3.5" Indoor Color Monitor1 x Outdoor Doorbell Camera2 x Charger 2 x USB Cable1 x Screw Pack3 x 3.7V Lithium Battery1 x Manual