Feature: 1. [SONAR SENSOR] The fish detector has a high‑sensitivity wireless sonar sensor, which can easily find and locate the position and depth information of the fish. 2. [LCD DISPLAY] Portable sonar fish finder, equipped with LCD display, allows you to read the data at a glance, which is convenient for outdoor fishing. 3. [ACCURATE DEPTH READING] 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 depth range is 0.8‑50M. 4. [EASY OPERATION] Put sonar sensor ball into the water. If a school of fish passes by, it will display current water depth and approximate fish depth, automatically distinguish the size of the fish. 5. [DEPTH ALARM] Visual sonar fish finder, supports depth alarm, which can be set by the user, supports the switch of British and metric units, and the measurement is accurate. Specification: Item Type: Fish Finder Material: ABS Power Adapter Voltage: DC 5V USB Purpose: Fishing, Fish Hunting Support Languages: English, Russian Basic Parameters: Depth Range: 0.8-50m / 2.6-164.0ft Wireless Working Range: 100m / 328.1ft (Up to 200m under the best conditions) Sonar Frequency: 125KHz Sonar Beam Angle: 105 Degrees Radio Frequency: 433MHz Depth Alarm: Users can set by themselves Working Temperature: -10-60℃ Unit: British/Metric can be switched Product Size: Approx. 120x68x20mm / 4.7x2.7x0.8in Power Supply: Host: Polymer Lithium Battery 3.7V 1800mAh (Built In) Sonar Sensor Ball: Polymer Lithium Battery 3.7V 1000mAh (Built In). Package List: 1 x Sonar Fish Finder1 x Sonar Ball2 x USB Charging Cable1 x Lanyard1 x Antenna1 x Manual Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.