Features: - Night vision, 720p picture resolution, and a picture and video recording function. - OS compatible)! Requires 2.4GHz bandwidth WiFi. - Requires 18650 lithium batteries (can charging by USB line)Two batteries can be used,continuous power supply 4-5 months - Three batteries can use longer time,about half a year Warm Tips: Not fully waterproof, please install it on the area without rain.2. The Wireless Video Doorbell supports WIFI 2.4GHz, DOES NOT support WIFI 5GHz. - Specifications: - Video Resolution: 720p HD - Power Source: 18650 lithium batteries 3 x 2600m - Ah - Field of View: 166° - Size: 14.4x3.23x7.45cm - Wi-Fi - Connectivity: 2.4 GHz - Memory card: Up to 32GB(Memory card is not include) - Infrared motion detection: yes - Colour: black - Package Includes: - 3x batteries - 1x doorbell - 1x set mounting screws - 1x Instruction manual - Size Guide