product description: C17: Cat headband Ding Dong has night vision 2.8 inch LCD screen Mega HD Pixels 160 degree viewing angle Using 4 AA batteries (not included) Support 4 kinds of ringtones, support 3-level volume adjustment Support Simplified Chinese, Traditional Chinese, English, Russian four languages Can take pictures, video, delete files Maximum support 32G memory card Adapt to door hole: 14-60mm Adapt to door thickness: 35-110mm Indoor unit size: 85*95*17mm Outdoor unit size: diameter 65mm Packing weight: 0.3KG Packing size: 145*118*70mm 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：145*118*70mm (including color box) total weight:300g