TL88 Handheld LCD Display Fish Finder Portable Fishfinder Fish Depth Finder with Sonar Sensor Features: Sensitive: The sensitivity can be adjusted freely according to the depth of water. Detect and display water depth, approximate fish location, fish size, short &amp; tall weeds, sand &amp; rocks on seabed. Setting can be saved when turned off. Apply to lake, river, sea and other fishing environment. Depth range from 1M to 100m. NOTE: The depth is measured from the sonar sensor, not the float. Round transducer with cable and removable transducer float. Can be used for fishing off the dock, on a boat, and ice fishing. Various features settings: 5 user selectable sensitivity; battery save mode; backlight mode; fish alarm; unit of measure. Water depth shows by meters/feet. Specifications: Condition: Color: As shown in the picture Measure Units: Meters / Feet Display: LCD&nbsp; Backlighting: LED 4.6cm diameter Round transducer sensor Depth Range : maximum: 100m (328ft) ; Minimum: 0.9m (3ft) Sensor Beam Angle: 45 degrees Display the nature or circumstance of bottom of Sea (i.e. grass, rock and sand) Operating Temperature is from -10°C to 45°C (14°F to 113°F) Battery: Uses 4*AAA batteries (Not included) How e the Sonar Sensor:&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 1. Toss the sensor and float into the water;&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 2. Attach the Side-Scan Adapter to the boat hull using the mounting tabs;&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 3. Attach the sensor to a handle, lower the sensor into the water. Package List: 1*Fish Finder 1*Instruction Manual 1*Lanyard 1*Fixing Screw 1*Fixing Frame 1*Sensor Note:&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 1. It will turn off automatically if the depth display reads "---" continuously for 5 minutes.&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 2. The transmitter is waterproof, but the receiver (unit with screen) is not waterproof, so please do not submerge or spray the fish finder screen with water.&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 3. It can not be used to detect bait fish(motionless) or fish that is smaller than 10cm.&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 4. When use this fish finder on moving boat, please make sure the moving speed is slowly (lower than 5 mph).&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 5. Extremely cold weather will impact the performance of the product. It is suggested that you keep the unit in temperatures above 0 degrees during operation.&nbsp;<br style="box-sizing:border-box;color:#333333;font-family:&quot;font-size:small;white-space:normal;" /> 6. Strong waves, suspended matter and muddy water,will affect the performance.