Terabyte Excellent Acoustic Mini USB2.0 Speaker (Black) Main features excellent mini usb2.0 speaker with 3.5 mm audio input port mini size facilitating carrying-on,usb power supply,portable and lightweight extraordinary tone quality, extra-loud speaker can be used in extremely noisy environment sweet timbre and fully clear sound,just enjoy it one of the best partner to your laptop or computer compatible with laptop,computer,mp3/mp4,cellphone etc.