1、2.4GHz Transmission Frequency: The smart doorbell has a 2.4GHz transmission frequency, and the barrier free remote control distance is about 100 meters, but if there is a wall, the barrier free remote control distance is about 20 meters. 2、TFT Color Display: The electronic doorbell adopts TFT color display, and the time is displayed on the screen. Time, brightness and call volume are adjustable. The monitor can be hung on the wall, cabinet, or placed on a table, etc. 3、Night Vision Function: This video doorbell is equipped with a 1MP camera, and the clear night vision can take images in a low illumination environment. 4、Monitoring and Wireless Unlocking: The night vision doorbell has the functions of monitoring, wireless unlocking, hands free calling. The indoor monitor is equipped with 8G small memory card, which can automatically take pictures and videos. Wireless unlock control supports power on and power off unlock modes. 5、IP55 Waterproof: The doorbell has 1 ringtone song and the BL 5J battery is replaceable and rechargeable. The outdoor camera comes with a rain cover and has an IP55 waterproof grade. Item Type: Smart doorbell Material: ABS, acrylic Weight: Approx. 1170g/41.3oz Adapter Output: DC 5V 1A Product Size: Indoor Unit: 225x129x20mm/8.9x5.1x0.8in Outdoor Unit: 165x110mm/6.5x4.3in Purpose: Villas, apartments, offices, hotels, public buildings, etc Battery: BL 5J lithium metal battery x2 1350mah, 4.9WH, 3.7V(Shipped with supporting battery) Local Storage: 8GB small memory card, shipped with small memory card(Installed on the product) Indoor Unit Specification: Screen: TFT LCD Sensitivity: 90dBm Working Current: 250mA Working Temperature: - 10℃ - + 50℃ Outdoor Unit Specification: Working Frequency: 2402-2483.5MHz Transmission Power: 16-20dBm Camera: 1/4in CMOS 1030 Working Current: 300mA 1 x Indoor Monitor 1 x Outdoor Unit 2 x Power Plug 2 x USB Line 1 x Color Cable 2 x Battery 8 x Green Expansion Pipe 9 x Screw 1 x Hex Wrench 1 x Instructions