Specifications: 10 level of sensitivity. 11 level white LED backlight. Can set fish alarm, depth alarm, contrast, chart speed(10 grades), fish display, unit(depth: meter/feet; temperature: Celsius/Fahrenheit). Water bottom contours and structure are showed in the middle as well as water depth, fish size, and location, etc. Item Name: Fish Finder Material: ABS Display: 2.4" TFT LCD White LED Backlight Sonar Sensor Battery: 3.7V 1000mAh Lithium Battery(Included) Receiving Host Battery: 4 x AAA Batteries(Not Included) Continuous Usage Time: Up to 5 Hours Depth Range: 0.6-36M Water Temperature Sensor: Built-in Sonar Frequency: 125KHz Radio Frequency: 2.4GHz Sonar Beam Angle: 90 Degree Wireless Operating Range: 100m Operating Temperature: -10 to 70 Degree Celsius 2 Modes: Sonar Graphic Mode and Stationary Float Mode 6 Depth Range: 3, 6, 9, 18, 36, Auto Receiving Host Length: 12.5cm/4.92" (Approx.) Receiving Host Width: 6.3cm/2.48" (Approx.) Receiving Host Height: 2cm/0.79" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Wireless Receiving Host 1 x User Manual 1 x Sonar Sensor(with Lithium Battery) 1 x Charging Cable 1 x Lanyard 10 level of sensitivity. 11 level white LED backlight. Can set fish alarm, depth alarm, contrast, chart speed(10 grades), fish display, unit(depth: meter/feet; temperature: Celsius/Fahrenheit). Water bottom contours and structure are showed in the middle as well as water depth, fish size, and location, etc. This product is economical, affordable and durable for most people.