Feature 1Adopt the design of waterproof gasket to make the sonar sensor float on the water. 2Using the visual display, you can clearly read the depth of the fish, which is useful for you. 3The sensitivity setting is adjustable, which can distinguish between big fish and small fish. 4With the alarm design for intelligently identifying fish, it is really convenient and helpful for fishing. 5Because of its lightweight, compact, it is easy and safe for user to carry and store.Item Type: Fish FinderMaterial: ABSDisplay: TN/ANTI-UV LCDBack Lighting: White LEDDepth Capability: Approx.328ft/100mPower Requirement: 4 x AAA alkaline batteries(not included)Waterproof Design: 4 levels (spray-water-proof)Show: Water depth, fish location, and bottom grass & rockUser Selectable: Sensitivity, depth units, and fish alarm settingOperational Temperature: -4 to 158(-20 to70) .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }How to Use: Connect the sensor to the display instrument, and then throw the sensor into the targetPackage List1 x Fish Finder1 x Hand Strap1 x Sensor (with Wire)1 x Bracket1 x Fixing Screw1 x User Manual