Teknetics Delta 4000 Metal Detector User-friendly metal detector ideal for coin shooting, relic hunting, and gold prospecting Large, easy-to-read LCD display with 2-digit numerical target ID system Running depth indicator identifies target depths from 0 to 8 inches Discrimination and All Metals modes; 3-tone audio discrimination Runs for up to 25 hours on single 9-volt battery; 7.8 kHz operating frequency