The Bounty Hunter Quick Silver digital metal detector finds large items buried up to a depth of 3" and smaller, coin-sized items up to 8" deep. It also comes with an 8" interchangeable waterproof coil that further increases the coverage depth and makes pinpointing easier. Equipped with Squelch-Tech, this unit has a fully automatic ground balance to prevent false signals. This deep-search metal detector has a 1-touch depth control and push-button discrimination. Its LCD screen displays a 4-segment digital target ID and 3-tone audio feedback to simplify your search. Connect your headphones to the jack to conduct your search discretely while in a crowded space. It needs two 9V batteries.