3.5-inch full color Dxr-8 LCD video monitor with interchangeable optical lens, Night view, laptop, interchangeable lenses, sound-activated recording, bidirectional audio, ambient temperature sensor. First monitor with interchangeable optical lens capability, allowing you to customize the view and zoom angle Large 3.5 inches all LCD display in elegant compact unit with antenna, retractable, with LED Display Equator Remote movement, slope and digital zoom Long-lasting battery, 10 hours in energy saving mode, 6 hours displaying in An optical zoom lens included. LED bar activated by sound for a better awareness of the situation in the dark, or when the screen is off. Remote panoramic/inclination/digital zoom Alarm function, bidirectional conversation, remote thermometer Extendable up to 4 cameras with scanning mode Invisible infrared night vision. Battery duration: Single 12-hour audio mode, 8-hour live screen Includes charge cable from the spare/extra monitor unit Back to two-way talk