JOYWEE FF688C 3.5" Color LCD Boat Fish Finder 200KHz/83KHz Dual Sonar Frequency 80M 240ft Detection Muti-language Auto zoom

This fish finder is designed for amateur and professional anglers to locate fish, determine depth, and map the bottom contour of water. It is suitable for use in the sea, river, and lake, and is effective for detecting schools of fish in a given area.
Display type: 3.5" 18-bit TFT V320XH240, readable in sunlight. Depth reading from 2 to 240 ft ( 0.6 -80 m) with 1/10th precision. Features bottom contour and water temperature indication. Offers 100 levels of sensitivity setting and multi-level depth range. "Stop chart" function can be activated at any time. Multi-language menu settings (English, Russian, French, Chinese, Japanese, Finnish, Polish, German, Italian, Spanish, Dutch, Korean, Swedish, Greek, Danish). Identifies big and small fish and indicates fish depth. User can select feet or meter reading. User can select sonar chart mode. Clear fish icons. Depth compensation. Audible fish and depth alarm; depth alarm range 3-99 ft.
Dual beam sonar frequency: 200 KHz / 83 KHz. Reduces interference from grass when used in lakes. Displays different bottom types (grass, sand, rock) in the sea.
Maximum output power: 800 watts;
RMS power: 100 watts. Battery strength indicator.
Note: The buttons are not waterproof