HD Visual Doorbell :Enjoy crystal-clear video footage of your doorstep with the 2.4 inch peephole's 120 degrees field of view and 240x320 HD resolution. Smart Digital Door Viewer :Keep your home safe and secure with the smart digital door viewer that sends alerts to your phone whenever someone approaches your door. 300000 Pixels Resolution :The 300000 pixels resolution ensures that you can see every detail of whoever is at your door, making it easier to identify and protect your home. Wired Connection :The wired connection ensures that you always have a reliable and stable connection to your doorbell, so you can always be sure that it's working properly. Two power supply modes: 3 1.5V/AAA batteries, 5V1A external power supply (product does not include battery) Colour:black Material:zinc alloy Size: 6cm Package Contents: 1 x 's eye outside the door 1 x hanging board 1 x host outside the door 1 x English manual 1 set x screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.