Fantastic for detecting schools of fish in any particular area. 2 ways of how the Fish Finder can be used With Rod and Line / Roach Pole With Bait Boats Note: ALSO AVAILABLE in RUSSIAN VERSION Features: Detects both fish location and depth Display Fish Icon and Live-Update Water Bottom Contour Language: English (default), Russian and Deutsch Resist interference from grass when used in lake Adjustable chart speed, sensitivity level, depth range, Sonar sensitivity setting Audible fish and depth alarm Zoom at specified depth Indicator for battery and Signal for Wireless Sensor Simulation mode Built-in memory stores sonar setting Sensor auto switch off when not in water CE & RoHS approved Specifications: Display: Adjustable High-contrast Dot matrix FSTN LCD 128(V) x 64(H) Display Size: 41 x 48mm Backlight: White LED with on/off option Frequency: 433 MHz wireless, 125 kHz sonar Wireless Sensor Coverage: 90° beam angle Depth Range: 45m Wireless operational range: 120 meters Water Temperature: °C/°F Units: meter or feet Operating Temp.: 14~122°F (-10~50°C) Storage Temp.: -4~158°F (-20~70°C) Battery life of Wireless Sensor: up to 550 hours in water usage IPX4 Water Resistant Design / Level-4 (spray-water-proof) Power Supply main unit: 4 x AAA Alkaline Battery (not included) wireless sensor: 1 x CR-2032 Button Battery (included) Size: approx. 136 x 74 x 30mm Weight: approx. 160g (main unit only) Set Includes: 1 x Fish Finder 1 x Wireless Sensor 1 x External Antenna 1 x Neck Strap 1 x 3V CR2032 Button Battery 1 x English User Manual