Features: The small USB DAC headphone amplifier adopts an optimized highfidelity audios architecture to ensure highresolution audios quality. The portable USB DAC DS2 is compatiblewith various system such as Androids/Windows/iOSand with thelatest devices such as mobile phones/computers/tablets/laptops/audios players. When commuting from home, office, or in games, the functions are very rich. DS2 adopts ESStechnology ES9018K2M DAC chip, supports DSD512 and 32Bit/768kHz PCM, highpower output, and can support the most demanding headphones with impedances exceeding 200. Low noise floor cleaning sound, achieving true highfidelity. DS2 has richpower, highsignal-to-noise ratios, low distortion, and almost no noise. The 3.5MMand4.4MM two earphone has powerful output function, which can easily drive most earphones. The traditional 3.5mm single ended headphone output is widely compatiblewith most headphones, while the 4.4mm balanced headphone output provides a more detailed audios experience. Specifications: Frequency response: 20Hz-20kHz Output power: 120MW/32 Recommended headphone impedance: 16-300; 16-300 Two headphone output: 3.5mm single ended and 4.4mm balanced headphone port Specification: THDandN100dB, Noise: less than 1.6UV Size:approx 5.51x1.19x1.91cm/2.17x0.47x0.75in Color: Red/Gray Material: Aluminum Alloy Note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set DS2Portable Decoding Headphone Amplifier Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.