PLUG & PLAY --- USB plug and play,no need for batteries or a power cord. The usb cable for power, the aux in cable for the sound and the RCA adapter can work with AUX cable for TV that has no standard 3.5mm port. Compatible with any device that has a standard 3.5mm headphone jack, such as desktops/ laptops/ smart phones / tablets/ Mac/ iPod/ projectors/ Monitors/ small TV and so on CRYSTAL CLEAR SOUND QUALITY--- The Z ZAFFRIO desktop computer speaker features dual powerful 5w superior sound drivers,dual treble and dual bass that can deliver a stunning sound to your desk and reproduce clear, pleasant sounds.Also,the front of the speaker has a full cover of steel mesh which the sound can pass lossless and provide good protection of the internal parts. BUTTON ADJUSTMENT--- The computer speaker has one useful volume control, which allows you to easily control the speaker sound volume to be perfect level. Using stereo + inverted sound expansion technology greatly reduces the distortion of the sound, providing you with a 3D surround sound experience.