Garrett Master Sound Headphones Garrett Master Sound Headphones Features: Built, field tested and approved for use with all types of metal detectors Efficient, wide dynamic audio range speakers enhance weak signals - FIND MORE TREASURE! Dual volume controls for adjusting signal levels to suit individual hearing requirements. Comfortable leather headband and ear cushions for maximum comfort. Reinforced 10-foot coiled cord with right angle, 1/4-inch stereo phone plug. Speaker impedance: 8 ohms per channel. Mono/Stereo. Frequency response: 30-18,000 Hz. 1/4" jack that plugs into ACE series detectors Requires 1/4" Headphone Adaptor to work with AT-Pro International, AT Gold, Infinium LS and ATX