1. wave wheel tuning knob, built-in DSP audio amplifier module, which can increase the volume by 15% 2. It is suitable for most earphones, compatible with mainstream equipment, and compatible with most earphones. It can convert the output analog signal of the , notebook, desktop, audio and other interfaces into digital signal output. 3. One-key operation, convenient and fast, quickly change the mode 4. Compatible with two headphone jacks, compatible with single/dual plug headset jacks 5. Driver-free installation, plug and play, compatible with windows7/8/9/10/XP /ista/ OX x 10.4-10.8/Linux Product name: USB sound card Number of interfaces: USB x 1, headphone port x 1, headset port x 1, microphone port x 1 Applicable slot: USB interface Input and output interface: linear output (front), linear input Support channel: 7.1 channel Installation : external color:black Material: plastic Size:18 x 3.5cm Package Contents: 1 x USB Sound card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.