This sonar sensor is a compatible accessory for LUCKY fish finders. It features wireless connectivity, a depth range of 45 meters, a 90-degree beam angle, and a sonar frequency of 125KHz. Constructed from durable plastic with a watertight seal cover and seal ring for reliable performance. Powered by a replaceable CR2032 battery. Designed with integrated holes for securing fishing line, allowing for easy casting. The D model measures depth only and is compatible with basic fish finder models such as FFW1108-1 and FFCW1108-1. The D+T model measures both depth and temperature and is compatible with most LUCKY fish finders including FFW718 and FF518. Specifications: Material: Plastic Model: D / D+T (optional) Depth Range: 45m / 147ft Beam Angle: 90° Sonar Frequency: 125KHz Dimensions: 7.8 x 5.5cm / 3.1 x 2.2in Weight: 45g / 1.6oz Package List: 1 x Sonar Sensor for Fish Finder