This is the Bluetooth speaker that combines the harmonically superior audio of analog vacuum tube technology with the convenience of wireless digital music. Its Raytheon vacuum tube, digital signal processor, and high-definition codec work in concert to generate warm dynamic tones and ameliorate the natural acoustic qualities of second and third harmonics without the distortion common to transistor-based audio. Its omnidirectional speaker creates a soft, smooth sound field in 360° from a high- and mid-range driver, adding punch and clarity to high bit-rate MP3s or Apple Lossless audio files with CD-quality audio played wirelessly from a smartphone or tablet. Provides 12 hours of power from five-hour USB charge. 9" H x 3" Diam. (1 1/2 lbs.)