Lucky Wireless Black Dot Matrix Fish Finder with Waterproof Bag Depth Range: 135 feet (45meter) ; Wireless Operational Range: 394 feet (120meter); Frequency: 433 MHz (Wireless); 125 kHz (Sonar) Display Water Depth & Temperature (C/F), Fish Size & Location Info, Clear and SUN-VISIBLE High-contrast LCD Monitor with Backlight MULTI-LANGUAGE: ENGLISH (default), RUSSIAN, and DEUTSCH. Adjustable chart speed, sensitivity level setting and depth range setting, sonar sensitivity setting. Audible fish and depth alarm Wireless Sensor Coverage: 90 degrees beam angle. Display live-update of water's bottom surface. ZOOM at specified depth. Use with rod & line / roach pole / bait boats. Best Fishing Tool for amateurs and professionals. Ideal Gear to be used in both fresh and salt water, suitable for offshore, river, lake, sea, turbid, ice fishing.