Features Durable Aluminum Alloy Construction - Made from high-quality aluminum, this filter is resistant to scratches and deformation, ensuring long-lasting performance for your observations Precision CNC Manufacturing - High-accuracy production guarantees consistent size and color uniformity, meeting stringent standards for optimal viewing experiences Superior Light Transmission - Designed with a high-transmittance filter that minimizes impurities, enhancing light transmission for clear and detailed celestial observations Compact and Lightweight Design - This filter is easy to store and transport, making it a perfect addition to your gear without adding unnecessary bulk Versatile Compatibility - Ideal for use with astronomical telescopes, this accessory effectively reduces light pollution, enabling safer and more precise observations of celestial bodies Features: 1、Sensitive: The sensitivity can be adjusted ly according to the depth of water. 2、Detect and display water depth, approximate fish location, fish size, short & tall weeds, sand & rocks on seabed. Setting can be saved when turned off. 3、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. 4、Round transducer with 25 ft cable and removable transducer float. Can be used for fishing off the dock, on a boat, and ice fishing. 5、Various features settings: 5 user selectable sensitivity; battery save mode; backlight mode; fish alarm; unit of measure. Water depth shows by meters/feet. Specification: Features: Sensitive: The sensitivity can be adjusted ly according to the depth of water. Detect and display water depth, approximate fish location, fish size, short & tall weeds, sand & 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. Specification: Condition:100% Color: As shown in the picture Measure Units: Meters / Feet Display: LCD 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 to use the Sonar Package List