Wireless Technology: 2.4 GHz FHSS 3.5-Inch Diagonal Color Screen with Digital Zoom, Two-Way Communication, Room Temperature Display, Infrared Night Vision, High Sensitivity Microphone, and Includes 5 Lullabies Picture-in-Picture Viewing, Expandable Up to 4 Cameras (Requires Additional Camera Sold Separately, Model: MBP38SBU) Up to 1000ft Range with Out-of-Range Alert. Flip-Out Stand LED Sound Level Indicator, Rechargeable Battery with Low Battery Alert Motorola is America's #1 baby monitor brand in America (2017 revenue data).