Raymarine Dragonfly 4DVS Dual Channel Sonar 4.3" All-weather, high-definition LED backlit display Optically bonded for sharp color, wide viewing angles and no internal fogging Dual-channel sonar - wide-spectrum CHIRP DownVision sonar for photo-like images and a second CHIRP conventional sonar channel for targeting fish Ball and socket tilt swivel mount lets you mount Dragonfly easily on any surface Includes transom mount CHIRP transducer with temperature sensor