Advanced Sounds high-resolution audio amplifier is designed for listeners that want to maximize their HiRes audio files with their HiRes earbuds! The built-in DAC and amplifier bring the audio processing required to render the HiRes audio files directly from your iPhone and iPod. Don't miss out on true audio, get the accessport today! High-resolution 24-bit Lossless AudioADVANCED Accessport provides stunning, high-resolution, 24-bit audio for your smartphones through any pair of headphones / earphones. The built-in, dedicated DAC and amplifier bring the intensive audio processing required to properly render the lossless audio right to the palm of your hand.Charge and ListenThe combination of charging port and audio port allows you to charge your smartphone while listening to your high-resolution music.Power up your HeadphonesThe Accessport provides enough power to drive headphones with impedance up to 300ohm.Maintain Call FunctionFull call-functionality via built-in button arrays or via in-line remote controls from your earphones using the certified components.*No Battery RequiredThe Accessport draws power directly from the smartphone at a ultra-low 40mW and does not require a separate battery. Specs: Chipset MCU with proprietary firmware Audio depth Up to 24-bit / 96,000hz Signal-to-noise ratio 122dB Power output 40mW (16ohm) Amplification Up to 300ohm MFi components C68 + LAM