Featherweight metal (190g) for portability, pack it in your bag as a backup battery pack when not in use as a headphone amplifier/ Universal Compatibility: Designed for portable devices including newer Androids*, iPhone, iPad, iPod as well as Mac and Windows OS. Use as a desktop, portable amplifier or hi-fi sound card via USB audio/ Amplifer: 150mW x 2 USB Audio / 130mW x 2 for iPhone, iPad, iPod amplifier powerful enough for high-impedence (>32 ohm) and large headphones/ Rotary Volume: Metal knob and on/off switch for precision volume control with Hi/Lo Gain: Switch between 80mW or 130mW/150mW output/ Bass/3D Button: pure mode (red), bass+ mode (green) and 3D Virtual sound button optimized for home and car audio with Optical Out: SPDIF/Toslink digital audio output transforms your device into a high fidelity source (3.5mm to optical cable not included)/ 2 Dedicated DACs: USB Audio DAC (computer/Android) and iOS DAC bypasses your device's internal DAC using USB or micro-USB to reduce the number of times your sound is re-processed/ Burr Brown & AKM DAC: Low noise components usually found only in hi-end digital players for pure audio with less resonance, reduced background noise and improved clarity/ Use as a backup power source, double your smartphone battery life or charge any battery-powered USB device (results may vary by device)
