Wireless Technology: 2.4 GHz FHSS 2.8-Inch Diagonal Color Screen with Digital Zoom, Two-Way Communication, Room Temperature Display, Infrared Night Vision, and High Sensitivity Microphone Up to 1000ft Range with Out-of-Range Alert, Expandable up to 4 Baby Units Includes 5 Lullabies LED Sound Level Indicator, Rechargeable Battery with Low Battery Alert on the Parent Unit he Motorola MBP36S is a wireless video baby monitor that enables you to always keep an eye on things. The crystal clear two-way audio feature allows you to very clearly communicate as if you are in the same room with your little one. Rest assured that they are always safe and sound with the large 3.5 inch diagonal color screen, remote pan, tilt, and zoom, and infrared night vision Motorola is America's #1 baby monitor brand in America (2017 revenue data). Pairing can be affected by other devices in range, the device being used as well as any obstructions in the range of communication