Unit Dimensions:4.3" (H) X 2.75" (W) X 1.18" (Thickness) Display Window Size:1.89" (Width) X 1.57" (High) Display Type:Virtual View Liquid Crystal Icon LCD Backlighting:Yellow-green LED soft glow Power Requirement:4 X 'AAA' Alkaline Batteries Units of Measurement:Feet & Meters Depth Range Max.:131 Feet (40 Meters) Depth Range Min.: 2.3 Feet (0.7Meter) Sonar Sensor Cable Length: 32Ft (10 M) Sonar Sensor Frequency:200K Hz Sonar Beam Angle:16 Degrees Temperature readings:0 to 122F (-18 to 50C) Operational temperature range:0 to 122F (-18 to 50C)