Portable Wireless fish detector with sonar sensor Waterproof Fish Finder LCD Display with LED Green back-lighting -up to 550 hours battery life for the wireless sensor Display size: 2 inch Get the approximate location of fish and the depth of water Wireless operational Range: 130Feets (40meters) Depth Range Max/Min: 130 Feet (40meters) / 2Feet (0.7meters) Back lighting: Green LED backlight