2.4GHz WiFi connection, 100% wire-free installation Built-in rechargeable battery powered and powered by 5V 1A USB cable Supports cloud storage service for alarm event recording (memory card not supported). Video call. When the visitor presses the doorbell, you will receive a video call on the APP (only on the APP interface) and receive a notification that the APP has pushed two-way audio. Built-in mic and speaker, you can talk with the visitor in clear night vision in real time. Night vision up to 5m. Provides day and night monitoring 90°view angle, when someone presses the video doorbell, the APP will capture the alarm events. Support indoor chime, when visitors press the doorbell, a clear indoor chime ringtone can be heard at home. You can share the doorbell with your families Download the free APP "Aiwit" on Google Play and Apple Store