Feature:1. [Sonic Fish Finder] Using intelligent sonar fish finding technology, built in high quality chips, stable performance, accurate detection, and quickly improve the efficiency of fishing spots.2. [TFT LCD Display] Equipped with TFT LCD display, with white LED backlight, it can detect and display the underwater contour, water depth and fish body size along with the depth.3. [Signal Stability] The wireless host connects and receives, the signal is stable, and the depth range is 2148Ft/0.636M, suitable for outdoor ice fishing, river fishing, sea fishing, etc.4. [Main Unit Waterproof] The main unit has good water resistance, does not sink, is scratchresistant, and there is no need to worry about water damage. The probe detection schematic diagram provides accurate detection.5. [Necessary For Fishing] The fish finder uses sonar to detect the depth of the water and the position of the fish. The sonar frequency is 125KHZ and the sonar beam angle is 90.Specification:Item Type: Fish FinderMaterial: ABSModel: ZN-AZ-TYQ-003Battery: 1.5V AAA x 4 (Battery Not Included), Lithium Battery 3.7V 1000mAh (Built In)Purpose: Detecting fish with sonar in waterSupport Language: EnglishBasic Parameters:1. DisplayDisplay Mode: TFT LCDDisplay Size: Approx. 58x45mm / 2.3x1.8inDisplay Points: 320x240Backlight: White LED Backlight2. Sonar And RadioDepth Range: 2-148Ft/0.6-36MSonar Frequency: 125KHZSonar Beam Angle: 90Radio Frequency: 2.4GWorking Temperature: -20 - 70.Package List:1 x Wireless Sonar Sensor1 x Portable Wireless Receiving Host (Battery Not Included)1 x Signal Bar1 x Product Manual1 x Sling1 x Probe Charging CableNote:1. When the sensor is working, do not touch the bottom of the sensor with your hands. Otherwise, the test result of the product will be wrong, and even the components inside will be damaged. If you want to take the working sensor out of the water, you can grab the end of the sensor housing and take it out.2. Our products can be used for a long time under normal conditions. However, due to the ups and downs of waves in the water, the sensor may be impacted, causing it to hit the reef and other objects, causing damage to the sensor.3. Due to the physical characteristics of ultrasound itself, when the water depth is less than 0.8 meters, we recommend not to use this product.