1. Indoor host built-in 2000mAh (long-term use recommended external power supply), outdoor doorbell built-in built-in 5000mAh battery; 2. Display size: 4.3 inches, resolution: 800 x 480; 3. Detection distance of 2 meters, outdoor host viewing Angle: 75 degrees; 4. Charging interface: USB-C, charging current: DC5V/1A; Battery life: outdoor host: 60 days, indoor host: 14H; Charging time: 5H; 5. Storage: video (memory card required,not include); Built-in 12 languages; Support night vision, configure 940nm infrared light; Support detection capture, PIR human body infrared detection; Support active viewing, support the indoor host to actively wake up the outdoor doorbell to view; Support detection of bright screen; Support two-way intercom; Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Color: As Shown Material: ABS Package Contents: 1 * Wireless Intercom Doorbell Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.