... : MD-5008 Power: DC12V Signal frequency: 7kHz Underground Gold Treasure Metal Detector with 40cm Depth MD5008 :Main features: 1,a ... long life 4, can be identified through headphones sound of metal products parameters: 5,maximum depth of exploration: small capitalization ... voice alarm and instrumentation, with the probing depth exploration of metal the size, shape, weight, have great relations, in ...