Fish like never before with the clarity and high accuracy of the CHIRP+ 2, combined with the Fish Deeper app. Plan, save, and analyze your fishing trips, create your own bathymetric maps, and access your data on any device. Optimize your fishing with your bait boat by enhancing the connection between your smartphone and the sonar over long distances. The Deeper Range Extender is an officially certified, high-quality, waterproof device that is easy to install. It comes with a smartphone mount compatible with most smartphone models. The Deeper Range Extender works with all Deeper sonars and is ideal for use with the PRO/CHIRP series.