The Bluetooth Sound Enhancing Amplifier - This is the hybrid vacuum tube amplifier that pairs with any Bluetooth music device to provide superior audio performance. Vacuum tube amplifiers are known to generate warmer, more dynamic tones than transistor-based models because they limit distortion when overloaded, providing better signal-to-noise ratio. - Hammacher Schlemmer
Dimensions: 3.14" x 3.14" x 2.48"; Weight: 0.47 lbs. Features Bluetooth functionality for one tap pairing Full range bass enhanced sound Bluetooth range up to 33 feet SNR (Signal to Noise Ratio): >60dB Frequency Response: 100Hz~20,000 Hz Designed to fit into most cup holders Built in microphone for hands-free phone calls.