When you’ve located a target and dug the hole, use the Bullseye II Pinpointer to precisely “pinpoint” the target. No tuning. Completely automatic. Works in either “vibration” or “beep” mode. Powerful LED light illuminates target areas when the button is pushed. Powered for up to 20 hours on a single 9-Volt battery. 36 kHz operating frequency, doesn’t interfere with any other metal detector.