Features: Rechargeable Wireless Sensor with Built-in Fish Attractive Lamp 3 Languages English (default), Russian and Deutsche Resist interference from grass Adjustable chart speed Adjustable sensitivity level Adjustable depth range Audible fish and depth alarm Zoom function Battery and Signal Wireless Sensor Indicator LED Backlight On/Off °C/°F Temperature Unit Meter/Feet Depth Unit Waterproof design level-4 (spray-water-proof) Built-in memory stores sonar setting Sensor will shut down when out of the water Specifications: LCD Display: Dot matrix FSTN LCD 128(V) x 64(H) / Size: 41 x 48mm Sonar Frequency: 125 kHz Wireless Sensor Coverage: 90° beam angle Depth Range: 45m (147ft) Wireless operational range: 150m (492ft) Operating Temperature: 14~122°F (-10~50°C) Storage Temperature: -4~158°F (-20~70°C) Power Supply Main unit: 4 x AAA Alkaline Battery (not included) Wireless sensor: 3.7V Rechargeable Lithium Battery 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 Charger and USB Cable 1 x Neck Strap 1 x English Manual