Save some time while searching for small, metal objects. This manageable, hand-held tool pinpoints buried objects up to 2-1/2" at maximum sensitivity. Easy-to-use, single knob control adjusts sensitivity from 0 to 2.5". Signals detection through audio sounds or through vibration. Designed for use with any metal detector. No assembly required. Runs on one 9-volt battery. One-year manufacturer's warranty.