These portable speakers are economical yet produce high quality, digital audio sound with 3D 7.1 virtual surround sound. PRODUCT FEATURES: Digital audio signal with 3D 7.1 virtual surround sound produces superior small speaker performance; Self-powered USB interface eliminates the need for an external power supply; Lightweight, compact design provides maximum portability while traveling; Snap-on, magnetic stands allow upright positioning or can be mounted to any metal surface; Included software is easy to install and operate.