100% CUSTOMER SATISFACTION: We provide 12 months warranty for your orders by 100% money back or free replacement. If you have any query, you can contact us freely. MICROPHONE & HANDS-FREE CONTROL: The in-line microphone enables your private con-call on computer, your voice can be clearly and closed heard by your team members. The 3 in-line keys enable the control for volume up / volume down / Play / Pause instead of clicking the mouse. (The functions may vary on different OS platform and / or applications). NOISE-ISOLATION & LONG CORD: 3-sizes of silicone ear tips are included for noise isolation. It blocks most ambient noise so that you can focus attention. The cord length is 5.9 FT / 1.8M, it is long enough to reach the USB port under the desk, and allows you moving freely. LIGHTWEIGHT, COMPACT & COMFORTABLE: Different to most bulky over-ear computer headset, this computer earbuds is small and lightweight. Only 38g for entire buds. The ergonomically designed buds is snugly fitting your ear canal securely and never oppress your sensitive ear muscle. No burden, no ear ache, perfect for daily working and learning. PLUG & PLAY, UNIVERSAL COMPATIBILITY for COMPUTERS: This USB in-ear earbuds equipped with a powerful DAC chip intergated with an USB-A plug. Just plug it into your computer via USB port and the crystal clear sound will stream out immediately, no more drivers and settings are required-just Plug & Play. It's widely compatible with multiple systems & devices: Windows 10 / 8.1 / 8 / 7 / Vista / XP, Mac OS, Chrome OS and Linux, HP / Dell / Lenovo / Asus / Acer / Mac & etc [USB2.0 Required].