This is the only weather alert system that provides alarms for multiple rooms in a house. Using the NOAA's Specific Area Message Encoding protocol, the base unit's illuminated color bar indicates a weather advisory (green), watch (orange), or warning (red) for your specific area. Its AM/FM radio plays weather alerts from the nearest National Weather Service station, sounding an alarm on its 2-watt speaker. The base unit sends audible alarms wirelessly to its two remote beacons up to 100' away, alerting those in different rooms that a weather situation is developing. The base station sits upright on a tabletop stand or can be wall mounted; includes antenna. Also operates as an alarm clock. Base station powered by included AC adapter or requires three AA batteries; remote beacons each require three AAA batteries. Base 7" H x 4 1/4" W x 1 1/4" D; beacons 2 3/4" H x 1 3/4" W x 1" D. (2 lbs.)