Fisher Gold Bug 2 Metal Detector w/6.5in Search Coil Black Standard. It offers extraordinary sensitivity; at 71 kHz it features the highest operating frequency on the market. The Gold Bug 2 also features iron discrimination is dust and moisture resistant has audio-boost and can operate in any type of soil with the choice of three mineralization modes. In the Iron Disc Mode the detector can identify hot rocks and small iron trash items like nails. An Audio Boost Mode increases the depth capability and automatically increases the volume of any faint signal such as a small or deep nugget. 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