The Humminbird XNT 9 20 T Transom Transducer is a black plastic sonar device designed for outdoor fishing activities. Specifically designed for use with fishfinders, it features depth and temperature monitoring capabilities using sonar technology. This transducer includes a transom transducer bracket for secure installation on the boat's transom. With a focus on durability and functionality, this model from Humminbird is perfect for anglers looking to accurately gauge the depth and temperature of the water for a successful fishing experience.