Lucky portable fish finder is a good assistant for sea fishing, ice fishing, shore fishing, etc. Fish alarm, water depth, and other details shown on the screen can satisfy your needs in fishing. Underwater contour display: There are 3 colors of the underwater contour display, you can choose any one you prefer. Detect sensitivity: It controls how many details are shown on the display. You can set up the sensitivity from 1 to 10. The more sensitive it is, the more details it can detect. Fish alarm: An alarm will sound when the fish finder detect fish corresponding to the alarm setting. It can distinguish the relative fish size(large, middle and small) in a certain water area. Units: You can choose four different units from the menu--M/℃, FT/℃, M/℉, FT/℉. Multi –ways to use: Attach the adapter to the fishing boat hull with the mounting tabs. Ice fishing, river fishing, sea fishing, kayak fishing and so on Specification: 1)Display:2.4inch TFT color LCD, pixels:240Vx960H 2)Depth Capability:328feet(100m) 3)Sonar Coverage:45 degrees beam angle in 125Khz 4)Power:3.7V rechargeable lithium batteries 5)Waterproof design:level-4(spray-water-proof) 6)Operational Temperature:14F to 122F(-10C to 50C) 7)Built in memory stores sonar setting when the fish finder is turned off Package contents: 1 x Professional Fish Finder 1 x Wired Sonar Sensor transducer 1 x Manual Quick Reference Guide 1 x USB AC Adapter 1 x USB Cable 1 x Bracket(FREE) 1 x Micro Auto Charger (FREE) 1 x Neck Strap (FREE) Note: The sonar transducer is waterproof, but the hand held fish finder is not. Please avoid the fish finder touching the water.