5.7-inch STN color LED , 6-stage brightness adjustment. measuring depth range: 0-300m Screen: 5.7-inch STN color LCD. Rang: 0~300m Auto range: No Auto gain: No Brightness adjustment: 6 stages Display speed: 8 stages including: *4, *2, *1, /2, /4, /8, /16, 0(stop) Background Color: Black Blue Operation Frequency: 200KHz Transmitting Power: 300W (virtual value) DS606-1 ECHO SOUNDER