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Product Specification: 1. Display Display: Dot Matrix LCD Display Size: 50x45mm Display Dot Number: 128*96 Display Contrast: 10~100% Backlight: White LED Backlight 2. Sonar & Radio Depth Range: 2-120Ft/0.6-45M Wireless Operating Range : 100m Sonar Frequency: 125KHZ Sonar Beam Angle: 90 degree Radio Frequency: 433.92 MHz Operational Temperature: -20 ~70? 3. Power Supply: Mainframe : Lithium battery 3.7V Transducer: Polymer battery 3.7V Packing List: Display * 1? Transducer * 1, ;Antenna * 1, USB charging cable * 1, neck strap * 1, ;English Manual * 1