Support Smartphone OTG DriveSupport smartphone OTG drive, it can meet to listen HiFi music anytime and anywhere. DAC-X3PRO is a high-performance decoding headphone amplifier for mobile phone/desktop/DVD/CD/TV. High-Class ComponentsUSB dac adopts PCB board which uses black immersion gold craft and high-class electronic components, such as classical CS8416, USB ASRC audio processing IC and DAC decoder IC ESS9023, headphone amp protection circuit, as well as power electronic filter magnetic ring to reduce switching power supply noise.