[Smartphone Notifications and Two-Way Audio] When someone presses the doorbell, it captures images and immediately sends a notification to your smartphone; With the built-in mic, you can see and talk to your visitors anytime and anywhere. [Night vision & ; Cloud Storage] With built-in high quality IR LED lamp beads, the image is also clear at night; Free cloud storage supported (3 days auto cycle coverage), no need TF card. [Equipped with doorbell chime] Strong and stable signal , easy to pair, transmission range between doorbell and chime is up to 10 meters; with USB power supply, easy to install, no worry about low battery. [Power Supply] The doorbell is powered by built-in 800mAh large battery, has long working time after being fully charged via power bank, AC adapter, computer, etc. no need to recharge frequently. Specifications： Color: Black Material: ABS Battery Capacity: 800mAh Doorbell Size: 8 * 4.5 * 2.4cm/ 3.1 * 1.7 * 0.9 inch Doorbell Weight: 60g/ 2.1oz Chime Size: 6.5 *