Specification: APP:ULOOKA Storage: Free forever Cycle days: 30 days Battery capacity: 1200mAh Battery life: about 1-3 months [depending on usage] Input voltage: 5V 1A Charging interface: Type-C Product size: Doorbell 1.69*0.62*4.17in, Ding Dong 1.77*0.62*1.96in Night vision function: Supports APP active wake-up: Supports Visual distance: 5 meters System support: Android or iOS 9.0 and above versions Note: 1. The product does not support memory card expansion 2. Storage is free without monthly rent. If you need video materials, please download and save them in advance. 3. The product does not have human body detection function, but you can actively wake up the doorbell in the APP to monitor the situation outside the door. 4. The doorbell is only compatible with 2.4G wireless WIFI network. Please choose a location with good signal for installation. Packing List: 1 * Doorbell 1 * Doorbell base+film 1 * USB Chime Receiver 1 * Charging cable 1 * Screw bag 1 * Instruction manual