THE DEPTH WHISPERER "PLUS TRANSDUCER" MODEL: The World's First SPEAKING Fish Finder! Know your depth constantly without having to focus on the numbers on your screen. Add voice output to any boat having ANY existing Depth Sounder or NO Depth Sounder at all. If your existing Lowrance Garmin Humminbird or other Depth Sounder is capable of NMEA output, save $ by choosing our "NMEA Accessory" model.