This sonar sensor is a great accessory for your fish finder.Features:Wireless sonar sensor for LUCKY fish finders.45m depth range.90-degree beam angle, 125KHz sonar frequency.Durable plastic construction with watertight seal cover and seal ring.Runs on a replaceable CR2032 battery.Special holes allow you to tie your fishing lie onto it, easy to cast.Note:D refers to Depth, D+T refers to Depth and Temerature.D transducer is for basic fish finders: FFW1108-1, FFCW1108-1D+T transducer is for most of the LUCKY fish finders, such as FFW718, FF518.Specifications:Material: PlasticModel: D / D+T (optional)Depth Range: 45m / 147ftBeam Angle: 90Sonar Frequency: 125KHzDimension: 7.8 * 5.5cm / 3.1 * 2.2inWeight: 45g / 1.6ozPackage List:1 * Sonar Sensor for Fish Finder