Feature: 1. Motions Sensing: The doorbell with built in PIR sensor can can push real time alert and notification on any triggered human detection. 2. The 2 Way Audio: Supports 1080P video and 2 way audio, the doorbell allows for more convenient communication without opening the door. 3. Good Monitoring: With infrared night vision and live view as well as 166° wide viewing angle, the doorbell ensures high home security. 4. Wireless Design: Having connected to 2.4GHz WiFi, this wireless door bell enables smart control through the APP on your mobile phone. 5. Reliable in Use: IP65 waterproof promises stable working under various weather condition, and the installation is also very simple. Specification: Item Type: Doorbell Model: BELL-19S Doorbell Power Supply: Built in lithium ion battery with 4800mAh capacity. Speaker Power Supply: 3 x AA battery, delivery without battery. Waterproof Grade: IP65 Waterproof Intelligent PIR Motion Detection: Sensitive and adjustable. Two Way Audio and Cloud Storage: Support up to 128G memory card, delivery without memory card. . Package List: 1 x Doorbell1 x Speaker2 x User Manual1 x USB Cable1 x Wrench3 x Wall Plug3 x Screw