Advanced multi-function, high-contrast round dot matrix gauges display graphic and numerical digital data. Each are NMEA 2000® data communications compatible, and connect within an affordable, high-performance LowranceNET™ network to display real-time readings from an array of compatible electronic probes (E.P.s), like fluid level, temp, speed, and more. Featuring advanced LED backlighting, with connectivity to a remote speaker for alarms. LOW 49611 fits standard 2-1/8" dia hole. LOW 49621 fits standard 3-3/8 dia. hole.