Fisher Gold Bug 2 Metal Detector w/6.5in Search Coil Black Standard. The Gold Bug 2 Metal Detector from Fisher is built for a lifetime of detecting. These Metal Detectors feature Fishers exclusive "Fisher Technology" which allows the user to adjust the sensitivity of the Metal Detector for different types of soil thanks to the "fine tuning" control knob. The Fisher Gold Bug 2 Metal Detector also has three different mineralization modes to help minimize false positive signals and a Disc Iron Reject Mode which helps to eliminate the false positive signals of ferrous metals such as hot rocks and nails. The Gold Bug 2 Metal Detector has an automatic ground balance circuit that will automatically balance the device for a perfect balance in any mineralization type. Also the patented Fisher Dual-Control Ground Balance System puts the "science" back into finding gold. Not only does this system provide unbeatable sensitivity but it also provides unique discrimination circuits that help the detector to sort through all the junk you find in the ground which often contain rust and minerals. A dual-knob automatic ground boosing circuitry turns the audio response and trigger capabilities on the Gold Bug 2 Metal Detector into a fine tuning mode enhancing the volume and sensitivity of the detector. Specifications for Fisher Gold Bug 2 Metal Detector: Manufacturer: Fisher Water Resistance Level: Waterproof Coil Finish: Black Battery Type: 9v Battery Life: 5 - 35 hours Battery Quantity: 2 Weather Resistance: Waterproof Features of Fisher Gold Bug 2 Metal Detector Extreme Sensitivity to Small Gold Nuggets High Precision Dual-Control Ground Balance Iron Disc Mode for Iron & Hot Rock Rejection Deep Target Audio Boost Lightweight & Hip-Mountable Available with Either a 6 1/2 or 10 Elliptical Search Coil Operating Frequency: 71 kHz Resistant to dust and moisture Convertible to hip-mount or chest-mount Weigh 2.9 lbs Uses two drop-in 9V batteries Dual-knob ground control for coarse and fine adjustment Package Contents: Fisher Gold Bug 2 Metal Detector Fisher GB2-6: Gold Bug 2 Metal Detector w/6.5in Search Coil Black Standard