1、PIR MOTION DETECTION: The doorbell has built in PIR sensor detects motion at the door, records videos in real time, and allows playback through the app. 2、INTELLIGENT WIFI CONNECTION: Visitors can make video calls, owners can view visitors without opening the door, and multiple users can watch simultaneously online. 3、ULTRA LOW POWER CONSUMPTION, LONG BATTERY LIFE: Easy installation with no wiring required, uses low power technology for over 8 months of usage, rechargeable and environmentally friendly battery. 4、ULTRA CLEAR INFRARED NIGHT VISION: Automatic switch with dual filter, powerful 850MM infrared light for up to 10 meters of night vision. 5、SUPPORT FOR REAL TIME MONITORING: Stay connected and monitor your home remotely, no matter where you are, keeping you updated on all activities at the door. The video intercom system is ideal for use in living rooms, kitchens, bedrooms, and doorways. Item Type: Video Doorphone System Material: ABS Maximum Resolution: 720P Doorbell Battery Type: 2 x Lithium Battery, 18650 (Batteries not included) APP Name: for Aiwit WiFi Version: 2.4GHz Storage: Support 8 to 128G memory card (Not included), Cloud Storage Waterproof Level: IP65 1 x Doorbell 1 x Double Sided Tape 1 x User Manual 1 x Charging Cable 5 x Screws 3 x Expansion Tubes 1 x Dingdong Machine