K300 wireless video door phone is convenient to install, and simple to use. It is specifically designed for villa users and two outdoor units can connect with three indoor monitors. 3 indoor monitors can communicate with each other .Main function is doorbell, intercom, monitor, remote unlock, motion detection, take and save videos and photos in tf card. It's communication range can reach 300 meters in open space. Configuration: Manual:1piece Waterproof case:1piece Outdoor unit:1piece Indoor monitor:1piece Wall hung holder:1piece Indoor monitor holder:1piece Charger (dc5v):2pieces Usb data line:1piece Lithium battery (bp-6m):1piece Screw m3:2pieces Screws for waterproof case:3pairs