High-Resolution LCD Screen: Features a 3.5-inch color LCD screen for clear visuals without the need for WiFi Wide Viewing Angle: Equipped with a 120 wide-angle lens to enhance doorstep visibility and security Easy Installation: Suitable for door thicknesses from 35mm to 100mm and hole diameters between 14mm and 28mm Privacy Protection: The peephole camera functions without storage, maintaining privacy with one-click viewing Type: Peephole Doorbell Sensor: 1 CMOS Sensor Screen Size: 3.5-inch LCD Screen Function: Energy Saving, Low Power Alert Power Supply: 4 x AAA Batteries (Not Included). Indoor Parts Size: About 118 x 63 x 18mm Outdoor Parts Size: About 32 x 32 x 8mm Door Hole Range: 14-28mm Door Thickness Range: 35-100mm (The product appearance and printed words depending on the batch, but this does not affect use) Color: B:Black & Silver Material: ABS Package Contents: 1set * Video Doorbell 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.