Infrared night vision: under the environment of insufficient outdoor lighting, the device automatically activates the infrared night vision, indoor host machine can clearly display or record the outdoor scenes. Users can select the desired doorbells freely. One key display: simple and convenient to use, view the outdoor scenes and take photos or record videos under manual or automatic mode just by pressing down one key. Usable at any time: active connection is adopted for the indoor set, it can be removed at any time for photo and video view, play, download, or deletion without the need of being detached. Super long standby: high capacity rechargeable lithium batteries are provided, adopting intelligent energy-saving technology, fully charged batteries provide up to 45 days of runtime. Have photo-taking, video-recording, IR night vision, handheld viewer functions.