Levels Grayscale Portable Wireless Fish Finder FF168W:   
Display type: 4 levels grayscale V128xH96 with white LED backlight
Depth reading from 2.0 to 100ft (30meters) in 1/10th precision
Bottom contour and water temperature indicator
10-level sensitivity setting and multi levels depth range
Auto zoom bottom tracking and quick manual zoom
“Stop chart” at any time
User selectable feet or meter reading
Big/small fish identification and fish depth indicator
Operational RF frequency: 433/315 MHz, operational range: 200ft (60meters)
125KHz sonar frequency
Customer's language menu
4 "AAA" batteries for main unit operation
Water Switch technology applied: Sensor could shut down when the Sonar Sensor is out of water
Built-in lithium battery for sonar sensor operation, recharge voltage: 5V
Water Activated Smart cast sensor