Feature 1、Adopt the design of waterproof gasket to make the sonar sensor float on the water. 2、Using the visual display, you can clearly read the depth of the fish, which is useful for you. 3、The sensitivity setting is adjustable, which can distinguish between big fish and small fish. 4、With the alarm design for intelligently identifying fish, it is really convenient and helpful for fishing. 5、Because of its lightweight, compact, it is easy and safe for user to carry and store. Item Type: Fish Finder Material: ABS Display: TN/ANTI-UV LCDBack Lighting: White LED Depth Capability: Approx.328ft/100m Power Requirement: 4 x AAA alkaline batteries(not included) Waterproof Design: 4 levels (spray-water-proof) Show: Water depth, fish location, and bottom grass & rock User Selectable: Sensitivity, depth units, and fish alarm setting Operational Temperature: -4℉ to 158℉(-20℃ to70℃) How to Use: Connect the sensor to the display instrument, and then throw the sensor into the target Package List 1 x Fish Finder 1 x Hand Strap 1 x Sensor (with Wire) 1 x Bracket 1 x Fixing Screw 1 x User Manual