This sonar sensor is a compatible accessory for LUCKY fish finders. Features: Wireless sonar sensor designed for LUCKY fish finders. Depth range: 45 meters. Beam angle: 90 degrees; sonar frequency: 125 kHz. Durable plastic construction with watertight seal cover and sealing ring. Powered by a replaceable CR2032 battery. Integrated mounting holes for secure attachment to fishing line, enabling easy casting. Note: D model supports depth only. D+T model supports depth and temperature. D transducer is compatible with basic fish finder models: FFW1108-1, FFCW1108-1. D+T transducer is compatible with most LUCKY fish finder models, including FFW718, FF518. Specifications: Material: Plastic Model: D or D+T (selectable) Depth Range: 45 m (147 ft) Beam Angle: 90 degrees Sonar Frequency: 125 kHz Dimensions: 7.8 × 5.5 cm (3.1 × 2.2 in) Weight: 45 g (1.6 oz) Package Includes: 1 × Sonar Sensor