Headphone Amplifier】 The headphone amp refer to well-known foreign brands,optimize and add OP Amp diffuser circuit, that maintain sound quality of original circuit, increase driving force and reserve gain interface,greatly improve playability. 【ASRC Transmission】Adopts USB ASRC transmission technology,support smartphone OTG directly drive.Sampling rate up to 24Bit/96kHz. DAC-X3PRO is a cost-effective audio decoder dac converter and headphone amplifier with USB ASRC transmission. 【USB Power Supply】Adopts USB power supply adaptive technology. Inserted separately USB cable, it can be automatically converted to USB power supply for the whole machine. It also can supply power directly from DC socket to meet your higher demand. 【Support Smartphone OTG Drive】Support 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 Components】USB 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 DCA decoder IC ESS9023,headphone amp protection circuit,as well as power electronic filter magnetic ring to reduce switching power supply noise. Chipset: ASRC USB+CS8416+ESS9023+NE5532 Sample Rate: 16bit-24bit/44.1kHz-96kHz RCA RMS Level: 2Vrms Dynamic range: 105dB Headphone power output: 45mW@16Ω, 85mW@32Ω, 160mW@64Ω, 150mW@120Ω, 65mW@300Ω (recommended 32- 300 euros) Input: USB, Optical, COAXIAL Output: RCA 3.5mm headphone amplifier Power Supply: DC 5V1A