The GSD 26 is a remote CHIRP sounder for the serious sport angler.CHIRP Spread Spectrum technology: GSD 26 CHIRP Professional Sonar Moduletakes high-definition gamefish targeting to a new level with digital Spread Spectrum technology, scanning on multiple frequencies at one time, returning vast amounts of data. As a result, you can expect precise, shallow-water-like target separation at much greater depths—up to 10,000'.Traditional sonar: Its traditional fixed frequency mode also lets you dial into specific frequencies, from a very low 25kHz to a high of 210kHz, to target certain species of sport fish, with significantly better target definition, bottom contours and signal noise suppression at greater depths than traditional models. Dual-transceivers allow for simultaneous and independent dual transducer operation, which allows complete customization. GSD 26 provides faster screen updates and a more timely interpretation of whats below for safer navigation and better fishing.Selectable transmit power: Designed for Garmins newest broadband transducers, the GSD 26 offers selectable transmit power from 300 to 3,000 watts.Specifications Frequency: Manually adjustable, from 25kHz to 210kHz Transmit Power: Selectable 300-3,000W Maximum Depth: 10,000' Dimensions: 14 11/16"W x 10 13/16"L x 3 15/16"H Included Equipment: Power cable and 6' Marine Network cable, mounting hardware, SD card NMEA Interface: Ethernet Compatible Devices: Compatible with the Garmin Marine Network for display on the latest Garmin GPSMAP 4000/5000 and 6000/7000/8000 series displays Transducer: Sold separately Waterproof Rating: IPX7 Warranty: Two years What's in the box GSD 26Power cableMarine network cable (6')Mounting hardwaresoftware update SD cardDocumentationTransducer OptionsThis product operates best with these select transducers, sold