product description: Cat headband with ding dong with night vision 2.4 inch LCD screen 2 million high-definition pixels 160 degree viewing angle Powered by 4 AA batteries (not included) Support 3 kinds of ringtones, support 8-level volume adjustment 12 languages supported Can take pictures, video, display date Maximum support 32G memory card Adapt to door hole: 15-60mm Adapt to door thickness: 40-100mm Indoor unit size: 22*97*97mm Outdoor unit size: diameter 65mm Packing weight: 0.29KG Packing size: 120*120*90mm packing list: 1: Indoor host *1 2: Outdoor handset*1 3: Metal hanging board*1 4: Screw bag*1 5: English operation guide *1 Product packaging size and weight: Color box size：120*120*90mm (including color box) total weight:290G