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Original Gray Ghost Detector PRO -USATE- Original Gray Ghost Detector PRO -USATE- very little, very good and comfortable. Original Gray Ghost headphones are designed for a professional search of coins and jewelry, the researcher recommended that claims the best response audio headphones. The Gray Ghost headphones are very sensitive and able to show very weak signals. Studied in protective material and with excellent isolation from outside noise, allowing to detect even the weakest signal response and far.