FiiO HS6 Headphone Amp Stacker for X5 Music Player with HS6 Headphone Amp Stacking Kit(includes Japanese Oyaide Brand Oxygen Free Silver Plated Copper Cable)
FiiO HS6 Headphone Amp Stacking Kit for X5 Music Player.  X5 Music Player and Headphones amplifiers not included.  Recommended to use with E12 Mont Blanc as shown in the picture.  Professional 3.5mm Stereo Audio Cable Kit for stacking the X5 with headphone amps.