With this fish finder, you can easily obtain information such as sea surface depth and conditions, fish depth scale and fish zone size, water temperature, fish schools and alarm depth. Features: This device is equipped with sonar frequency system with LCD screen, powerful performance, up to 120 feet. Can sound fish sounds and depth alarms from 2 feet to 120 feet. Compact, lightweight and portable, it can easily fit into your pocket. Can be used for boat fishing, platform fishing, long range fishing and ice fishing. 100m/328ft cordless operation, 45m/147ft depth capability. 90 degree beam angle at 125Khz (wireless). Wireless, no need for long and heavy sensor cables. Specifications: Batteries: 4 AAA batteries (not included) Power: 0.1WD Depth: 2-120 feet Wireless operation: 100m Sonar frequency: 125KHZ Sonar beam angle: 90 degrees Radio frequency: 433.92 MHz Operating temperature: -20~+ 70C Item size: 125*72*30mm/4.92*2.83*1.18in Item weight: 205g/7.23oz Packing size: 250*110*80mm/9.84*4.33*3.15in Packing weight: 350g/14.11oz Packing list : 1*fish finder 1*sensor 1*antenna 1*USB charging cable 1*strap 1*English manual