for Smart Portable Depth Fish Finder with 100M Wireless Sonar Sensor for Echo Sounder LCD Fishfinder for Lake Sea Fishing Saltwater Feature: This fish wireless sensor uses wireless sensor,you can cast it out on the water,the placing location is flexible. The wireless sensor uses for echo sound to detect fish,is fit for sea fishing,river fishing,lake fishing and ice fishing etc. It is small and lightweight,a practical and portable tool to use,is convneinet to carry. With it to easily detect the fish,it can make you don'for t need to for always watch the fishing buoy. You can adjust the sensitivity settings,then the device can detect and distinguish the small fish and big fish. Specification: Material: Plastic. Color: Show as picture. Size: Show as picture. Depth Range: 2-120Ft/0.6-45M Wireless Operating Range : 100m Sonar Frequency: 125KHZ Sonar Beam Angle: 90 degree Radio Frequency: 433.92 MHz Operational Temperature: -20 ~70. Battery: Mainframe : Lithium battery 3.7V(not included),Transducer: Polymer battery 3.7V(not included). Battery:AA 5 batteries Note There might be a bit color distortions due to different computer resolutions. There might be a slight errors due to different hand measurement. Package included: 1 Fish finder.(Battery not included) 1 Sensor. 1 Antenna. 1 Manual. 1 USB cable. 1 Rope.