The Lucky Sonar Fish Finder is a portable handheld device powered by a 3.7V Lithium-ion battery, with an optional power input of DC 10-18V. This wireless echo sounder features a sonar frequency of 125Khz and an accuracy of 45 meters, detecting a range of 0.6 to 73 meters. With a sonar coverage of 90 degrees, this fish finder is perfect for fishing enthusiasts looking to locate fish in the water. The device also comes with English language settings and is designed for wireless use, providing convenience and ease of use for anglers.