Please kindly see the specification of Portable Fish Finder as followings:
NEW ARRIVAL Boat Color Fishfinders FF688C：
1) Display type: 3.5" 18 bit TFT V320xH240 with white LED front light
2) Superb viewing in direct at sun
3) Multi-language menu(English; Russian; French; Chinese; Japanese; Finnish; Polish; German; Italian; Spanish; Dutch; Korean; Swedish; Greek; Danish)
4) Depth reading from 2.0 to 1500ft (500M) in 1/10th precision
5) 100-level sensitivity setting and multi levels depth range
6) Auto zoom bottom tracking and quick manual zoom
7) Stop chart at any time
8) Big/small fish identification and fish depth indicator
9) User selectable sonar chart mode
10) Kell offset
11) 200KHz / 83KHz duel beam sonar frequency
12) Input power: DC 10 to 18V
13) 1800 watts peak-to-peak power; 240 watts RMS power
14) Transducer: side hull transform mount
15) Water proof connecter between main unit and transducer
