This adaptor will enable you to connect headphones with a 1/4 inch jack plug to a metal detector with a 1/8 inch mini-jack socket. The adaptor kit is designed specifically for the Garrett Ace Apex detector, but may be used with any metal detector that has a 1/8" mini-jack socket. The kit consists of an adaptor lead and a clip to neatly fasten the socket end of the lead under the arm cup.