If you are looking for a stylish and powerful device to enhance the sound quality of your computer, the M2 is the best choice to enhance the sound quality of your computer. This M2 is Mini PC USB DAC (external sound card), which is portable and powerful. And, it uses asynchronous audio transmission technology and supports ASIO (Audio Stream Input Output), WASAPI (Windows Audio Session API). Moreover, it can support the line output / optic output and headphone amplifying output, and the multiple output can meet diverse needs. 

Features:    
MINI computer USB decoder (External sound card).
Uses asynchronous audio transmission technology .
Supports ASIO (Audio Stream Input Output), WASAPI (Windows Audio Session API) drive.
Supports the line output, optical signal output and Headset amplifying output.
Offer you the best way to enhance the sound quality of your computer. 
No need external power supply, powered by computer and other suitable devices with USB interface.
Ultra small size, easy to carry and very convenient to use.

Specifications:
Interfaces: 1 * Computer USB port; 1 * Headphone output interface; 1 * line and optic output interface. 
The performance index:
The USB receiver chip: SA9027
DAC decoder chip: ES9023
Headset amplifier chip: MAX9722
Sample rate: 32~96KHz (including 88.2KHz)
Width: 16~24Bit
USB transmission specifications: USB2.0, asynchronous audio transmission
THD+N:DAC <0.003% amp <0.005%
Frequency response: 10Hz~48KHz
Impedance adaptation: 8 ω ~600ω
The maximum output power: 130mW + 130mW / 32.
Dynamic range: 110dB (24Bit)
Signal to noise ratio: DAC>105dB amp >100dB
The output amplitude: 2Vrms
Power consumption: <0.5W
Color: Black
Main item size: 8.6 * 5.8 * 1.0 cm / 3.36 * 2.28 * 0.39in
Main item weight: 56g / 1.99oz 
Package size: 13.0 * 9.2 * 5.5cm / 5.12 * 3.62 * 2.17in
Package weight: 196g / 6.92oz

Package list: 
1 * SMSL M2 DAC 
1 * USB Cable 
1 * (English / Chinese) User Manual