1、2.4GWiFi Connection: Smart doorbell supports high speed 2.4GWiFi connection to ensure stable video transmission and two way voice call quality, and has noise reduction function. It also supports waking up the device through the mobile phone within 1s. 2、Alert Notifications: Doorbell can let you know when someone is visiting by motion detection or sending alert notifications when a person presses the doorbell. It can connect to an existing doorbell wiring or pair with a sync module for real time viewing and 2 way audio communication. 3、PIR Detection: Wireless doorbell supports human infrared detection technology. When someone knocks on the door, it will immediately push the alarm information to the mobile APP to provide safer home protection. 4、All Weather Monitoring: Smart video doorbell has the function of automatically switching day and night modes, providing millions of high definition pixels, ultra thin 2.6mm wide angle lens, to ensure a clear and visible picture. 5、Long Battery Life: Smart video doorbell has a built in high capacity polymer lithium battery, which can work for 5‑8 months without frequent charging, even without using a wired power supply. Item Type: Smart Video Doorbell Material: Plastic + electronics Resolution: 1920 x 1080 Angle of View: 2.6mm at. F2.0/155 degrees IR LED: 6 x 850nm WiFi: 802.11 b/g/n Memory Card: Maximum support 128GB (not included) Speaker: Built in 8Ω/1W Battery Type: Included Indoor Ding Dong, single battery capacity 900mah AAA battery x 3 (included) Video doorbell built in 5000mAh lithium battery (included) 1 x Smart Video Doorbell 1 x Indoor Ding Dong Machine 1 x Double Sided Self Adhesive 1 x Doorbell Charging Cable 3 x Screw 3 x Plastic Expansion Tube 2 x Metal Clip 3 x AAA Battery 1 x Manual