Features: 1.Wireless sensor can be installed on fishing rod. 2.It can be used in fresh water and salt water, determine the position and depth of the fish. 3.Wireless sonar sensor with built-in water temperature sensor. Display water temperature in °C or °F. Show fish icons, and update sea bottom contours in real time(grass, sand and rocks). 4.Identification of large and small fish, it can Resistant to grass interference when used in lake. 5.Adjustable chart speed and depth range Settings. Adjustable sonar sensitivity settings. 6.With alarm when find the fish and its depth. 7.Choose between meter or foot readings. 8.Built-in memorizer memory sonar settings. 9.When the sensor is out of water, the wireless sensor will automatically shut down Specifications: Material: ABS Color: As picture shown Size: Approx. 12.5x7.5x3cm/4.9x3x1.2in Wireless operating range: 50m (164 ft) Host waterproof grade: IPX4 Sensor battery lifetime: Maximum 550 hours.(not included) Packing List: 1x Wireless remote control sonar sensor 1x Wireless receiving host 1 x Manual 1 x Charging cable 1 x String 1 xAntenna