Item Description Display size: 3.2 inches. Camera resolution: 1280720. Viewing angle: 170 degrees. Color: outdoor red bronze indoor champagne gold. Cat's eye material: zinc alloy. Operation: Press the key. Doorbell / infrared night vision: Yes. Zoom Factor: None. Camera clarity: 1.3 million pixels day and night security dedicated. Door hole diameter: 15-55mm. Suitable thickness: 40-115mm. Storage: Photo. Video Voice Message: Yes. Automatic camera / video: Yes. Pir Automatic detection alarm: Yes. Do not disturb the function: None. Power supply: lithium battery. Battery capacity: 3500mAh (standby one month). Visual function: Yes. linkage smart lock remote unlock: can be added.