Honeywell TN924W Weather Information Station, Black Automatically sets to the US atomic clock, dual crescendo alarm with programmable snooze User-friendly sunrise and sunset calculator, moon phase calendar NOAA same technology, public alert certified device 7-Channel capability-accepts up to 4 additional sensors (sold separately), programmable ice warning alarm 200 weather records without pc connection, usb port, operating range from 100-feet (30-meters) up to 328-feet (100-meters)