Original Xiaomi Smart Doorbell 4(Black)

1. Doorbell rated input: 5V/2A
2. Doorbell wireless connection: WiFi IEEE 802.11b/g/n/ax, 2.4GHz, Bluetooth Low Energy, 433MHz
3. Doorbell battery capacity: 5100mAh
4. Doorbell storage: Cloud storage
5. Doorbell operating temperature: -10°C to 45°C
6. Doorbell charging temperature: 0°C to 45°C
7. Doorbell compatible systems: Android 8 and iOS 12.0 and above
8. Doorbell receiver rated input: 100-240V, 50-60Hz, 0.04A
9. Doorbell receiver wireless connection: 433MHz
10. Doorbell receiver operating temperature: -10°C to 45°C
11. Doorbell receiver operating humidity: 10%-90% RH, non-condensing
12. Dual cameras, upper and lower, with a wide field of view
13. 3MP HD main camera captures crystal-clear details outside your door.
14. Infrared night vision provides clear visibility in dark corridors.
15. 120-day battery life eliminates the need for frequent charging.
16. Wide infrared sensor coverage accurately detects whats happening outside your door.
17. 72-hour free cloud storage for easy playback of important information.
18. Supports Xiaomi Pengpai Smart Link for cross-device access to door activity.
19. Security chip encryption protects data and privacy.
20. Voice-changing intercom function prevents gender and age from being revealed.
21. Two-way calling for easy access to doorbell status.
22. Multiple anti-lost features and removal alarm.