lucky portable fish finder handheld kayak fish finders wired fish depth finder sonar sensor transducer for boat fishing sea fishing lucky 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/°c, ft/°c, m/°f, ft/°f. 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:14°f to 122°f(-10°c to 50°c) 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.