Features:Instant Notification & 2-way Audio: When someone presses the doorbell, cellphone connected to it will receive an instant notification, and will be able to talk to the vistor. You can use the mobile app to talk to the person who rings the doorbell in real-time. The video doorbell connects with 2.4GHz WiFi (not support 5GHz ).Multiple Users & Free Cloud Storage: The smart video doorbell supports multiple family members on the online app. You can simply share the doorbell with your family in the app. It supports sharing up to 10 members using at the same time. The wireless wifi doorbell also supports encrypted cloud storage and 3-day free rolling storage are provided. Wireless Indoor Chime: The smart doorbell comes with a wirelesss indoor chime, 38 built-in melodies with adjustable volume.Night Vision & Voice Change: With Built-in 850N night vision lights, you can also see very clearly at night. The smart doorbell also supports voice change, women's voices into men's voices. Rechargeable Battery & Easy Installation: This smart wireless wifi doorbell camera is powered by a 800mah built-in rechargeable battery, which can work for about 3 months after a full charge. The installation is quite easy, simply refer to the user manual and take about 5 minutes to set up with double sided tape.Specifications:Material: ABS material, PCB A, polymer battery, speaker, camera, metal hardware.Battery Capacity: 800mAPower Supply: 5V=2ACharging Time: 1.5 hoursStandby Time: 2 years or moreRecords are stored for 3 days (today, yesterday, the day before)Camera Resolution 480*640Doorbell Size L*W*H: 80*53*22mmDingtone Size L*W*H: 55*42*25mm, (including USB: 12mm height)Weight: about 140gColor: WhiteNote: The APP can only work with iOS and Android OS . Package Includes: 1 x Smart WiFi Video Doorbell1 x USB Charging Cable1 x User Manual