[Smartphone Notifications and 2-Way Audio] When someone press the doorbell, it will capture images and push a notification to your smartphone immediately; with built-in mic, you can see and talk to your visitors at anytime and anywhere.  [Night Vision & Cloud Storage] With built-in high-quality IR LED lamp beads, the picture is also clear at night; supported free cloud storage  (3-day automatic cycle cover), no need of TF card. [Equipped with Doorbell Chime] Strong and stable signal, easy to pair up, the transmission range between the doorbell and chime is up to 10 meters; with USB power supply, easy to install, no worry of low battery.   [Power Supply] The doorbell is powered by built-in 800mAh large battery, has long working time after fully charged through power bank, AC adapter, computer, and more, no need to charge frequently. Specifications: Color: Black Material: ABS Battery Capacity: 800mAh Doorbell Size: 8 * 4.5 * 2.4cm/ 3.1 * 1.7 * 0.9inch Doorbell Weight: 60g/ 2.1oz Chime Size: 6.5 * 4.5 * 1.4cm/ 2.5 * 1.7 * 0.5inch Chime Weight: 30g/ 1.05oz Note: The smartphone showed in the pictures is not included. Package List: 1 * Doorbell 1 * Chime 1 * Bag of Screws 1 * Double-Sided Sticky Mat 1 * User Manual (English)