This is a Miner John Designs 5 ft. heavy duty Minelab after-market power cord. The SD 2100, 2200, and the GP 3000, 3500, Extreme models Minelabs all work with this 4 pin power cord.
Built to be very solid and hassle free. Light yet super strong, and you do not want to be out hunting and have the stock coiled cord go bad without a backup. Makes the perfect full time power cord or keep it in your pack as a spare. Either way they are nice!