This amazing Fish finder is equipped with 2.8inch Colored LCD Screen,especially Designed for Amateur and Professional fisherman alike, find out the locations to the Location of Fish and Depth of Water. The Unit can be used in Ocean, River or Lake and is fantastic for detecting schools of fish in any PARTICULAR area.This wireless fish finder uses sonar technology to send sound waves from the wireless sonar sensor, the returned "echoes" are transmitted with wireless technology to the display unit and displayed on the LCD. And has also the following advantages : Water Temperature measurement in displayed in either °C or °F, Auto & Manual range selection and wider 0.7-45M (2-145ft) depth range coverage. It comes with 3.7V Rechargeable lithium battery.Features:3.7V Rechargeable lithium batteryWireless Sensor w/ 90° beam angleSelectable Depth Unit : Meter / FeetHigh frequency,125kHz (wireless)°C / °F temperature unitTwo Language option : English and RussianBlue,Orange or Grey Selectable in Color Tone Menu FeaturesDisplay bottom changing contourHigh/Low sensitivity setting, audible fish and depth alarm180 meters (590 feet) wireless operational rangeWater temperature and battery strength indicatorWith Simulation modeDisplay Large and Small Fish Icon with on / off featuresUse Antennas in order to increase the wireless receiving distanceCompact and Portable, easy to carry anywhere100% waterproof design: floating main unit and sensor Specifications:Fish finder (Main Unit)Display : 2.8inch color TFT LCD Display 240*(RGB)*320Depth unit : Meters / FeetLanguage : English or RussianOperational Range : 590ft or 180MetersColor Tone Menu : BLUE, ORANGE or GRAYPower Input : 3.7V rechargeable lithium batteryCharger Voltage : AC 5V,1A.Running Time : 20 hours (depend on actual using and working status)Wireless Sonar SensorSonar Operating Frequency : 125kHzSonar Coverage : 90° beam angleDepth Capability : 2-145 ft (0.7-45M)Operational Wireless Frequency : 433.92MHzBuilt in temperature sensorPower Supply : 1 x CR-2032 Lithium batteryApproval : CE-Approval Set Includes:1 x Colored LCD Fish finder1 x Wireless Sensor1 x CR2032 battery1 x Charger Plug1 x USB charge Cable1 x Neck Strap1 x Vehicle Cigar Plug Charger (You may charge the battery inside the car)1 x Waranty Card1 x English Instruction ManualStandard Packaging Box