Uniden QT-206W Digital Depth Finder Transom Transducer Designed to give depth readings from 2.5 feet to a maximum of 199 feet Large, back-lit LCD screen ideal for night time navigation Features a shallow-water alarm that can be set from three to 30 feet Operates on a 200 KHz transducer frequency and has 250 watts of transmitting power Backed by a manufacturer's one-year warranty