Delivers audiophile Reference sound quality, even when you"re outdoors A portable amplifier that"s purpose-designed for high-performance headphones The HA-P50 is the ideal headphone amplifier for the audiophile on the go. Allows you to take that great Reference 501-grade headphone listening experience outdoors and enjoy it wherever you want to go. Packs a high-performance digital-to-analog adapter and high specification power amplifier circuit into a compact body, to bring out the very best from quality headphones. Gets high-quality sound from your iPhone or Android via USB digital input Digital audio signals stored in your iOS device or Android are extracted digitally via USB and processed through the HA-50"s high-performance built-in digital-to-analog converter, with minimal sound degradation and allowing the purest playback quality, with maximum fidelity. The HA-P50 can be used with the free TEAC HR Audio Player app for high-resolution 24bit/96kHz audio playback for iPhones and other iOS-based devices... there"s no need to buy a separate adapter (such as the Apple Camera Connection Kit) in order to connect. Also comes with rubber fixing straps for securing it to an iPhone or Android handset, making the HA-P50 very easy to carry around. Uses a BurrBrown PCM5102 digital-to-analog converter The built-in BurrBrown PCM5102 digital-to-analog converter is capable of processing digital audio signals up to maximum 24-bit/96kHz resolution High 160mW + 160mW output gain (at 32Ω load) Fitted with a 160mW + 160mW high-output power amplifier (at 32Ω load). Lets you drive 600Ω-class headphones at full power.