SE GP-MD16 Professional Quality Metal Detector with 6-1/2" Diameter Waterproof Search Coil and Adjustable Stem Metal Detector is easy to use and great for treasure hunting in many different terrains including shallow water Waterproof search coil is 6-1/2" in diameter and can be used in uneven terrain, tight spaces and shallow water Large easy to read controls for sensitivity, volume, battery test and discrimination tuning Discrimination feature allows you to filter out specific metals based on your tuning adjustment Dimensions: total length is 31" to 43" with an adjustable stem that extends from 16" to 28"