This wireless sonar fishfinder adopts the latest advanced sonar detection technology to display live update of the water bottom contour and scan a large area in just a few minutes. It can be used in ocean, rivers, lakes, ponds, reservoirs, etc. Features: Wide and clear dot matrix LCD display. Depth readout ranges from 2.0~135ft and display bottom changing contour. High / low sensitivity setting, audible alarm of fish and water depth. 150m / 500ft wireless operating range. Wireless sensor with 90 degree beam angle. Water temperature and battery indicator. Rechargeable wireless sonar. Can be used as a depth sounder. Adjustable sonar sensitivity setting. With simulation mode. 100% waterproof floating sensor. 3 languages for choice: English, German, Russian. Detects both fish location and depth in both fresh and salt water. Fish icon and live-update water bottom contour (grass, sand and rock) in the sea. With alarm and adjustable chart speed, sensitivity level setting, depth range setting. Specification: - Host Display: Adjustable high contrast dot matrix FSTN LCD 128V x 64H Display Size: 41 * 48 mm (1.61" * 1.89") Back Light: ON / OFF white LED Zoom: OFF / 5m / 10m/ 20m / 30m / 45m Depth Alarm: OFF / 5m / 10m / 20m / 30m / 45m Sensitivity: 5 levels Chart Speed: 4 levels Power Requirement: 4 x AAA battery (not included) Depth Unit: Ft/m Temperature Unit: ℃ / ℉ Bottom Contour: Show true changing of water bottom contour Memory: Built-in memory stores sonar setting when the unit is turned off Waterproof Rating: IPX4 (Spray waterproof) Language: English, German, Russian Operating Temperature: -10~+50℃ Storage Temperature: -20 ~+70℃ Size: 122 * 75 * 31mm / 4.8 * 3.0 * 1.2in - Sensor Depth Range Max / Min: 45m / 0.7m (147.6ft / 2ft) Wireless Operating Range: 150m / 500ft Coverage: 90 degrees beam angle in 125Khz Power: 1 * 3.7V rechargeable Lithium battery (included) Size: 80 * 60mm / 3.1 * 2.4in Weight: 70g / 2.45oz Package Size: 20.5 * 16.5 * 7.7cm / 7.28 * 6.50 * 2.24in Package Weight: 439g / 15.5oz Package List: 1 * Professional Dot Matrix Wireless Fish Finder 1 * Wireless Remote Sonar Sensor 1 * DC Adaptor 1 * Charging Cable 1 * User Manual (English) 1 * User Manual (Russian)