This is the gauge that displays collected rainfall from a remote sensor via a 433 MHz open-air radio signal up to 300' away on a digital display. With 27 1/2" of collection surface area, the 7" L x 5 1/4" W x 5" H sensor measures up to 393.6" of rainfall (empties itself) and sends its data every 45 seconds to the 3 1/4" H x 3 1/2" W x 1 1/4" D display, which shows rainfall on a 10-section cylinder graph that automatically adjusts with additional precipitation. It can be commanded to display current, 1-hr, 24-hr, seven days, a month, year, or total rainfall in addition to indicating the actual strength of droplets striking the remote sensor. It provides a 24-hour rain alert, can display in mm and inches, and provides indoor temperature and 12/24 time. Sensor can be mounted to a surface. Requires four AA batteries (two for sensor; two for display).