Digital audio monitoring system has extra features to help monitor baby's comfort, such as on-screen temperature reading, remote-controlled nightlight and two-way communication. range up to 650 feet two-way communication monitor temperature in baby's room, reading on parent unit with option for Fahrenheit or Celsius reading nightlight with remote on/off built-in belt clip adjustable volume control out-of-range and low-battery alerts sound-activated LED lights indicate the level of noise coming from baby's room transmitter: 1.25x2.75x3.5H monitors: 1x2.5x4.75H requires 1 rechargeable Ni-MH battery, included partially assembled; instructions included ABS plastic spot clean imported