Bowers & Wilkins T7 Portable Bluetooth Speaker, Excellent Bass, Black PORTABLE HI-FI AUDIO - T7 is a hifi speaker you can pick up and play anywhere. Just charge it up, and it's good for 18 solid hours of playback. Take your premium audio with you. HI-RES BLUETOOTH TRANSFER - With T7, you can stream audio directly from any Bluetooth-enabled PC, tablet, or mobile phone. T7 uses Bluetooth aptX, which allows the transfer of high-res audio data to produce exceptional sound quality, wirelessly. TWIN BASS RADIATORS - Designed for the optimum balance of movement and stiffness, the T7's twin bass radiators deliver beats and bass lines with serious depth and impact, unrivaled by any other bluetooth speaker. Power supply voltage: 100-240Vac, 50/60Hz,1.0 Amps(power supply),output: 15Vdc, 2.0 Amps. REDUCED VIBRATION AND DISTORTION - T7's rock-solid stability is thanks to Micro Matrix: a rigid honeycomb of interlocking cells that brace the cabinet and reduce vibration and distortion. 2 YEAR LIMITED WARRANTY - Bowers & Wilkins' T7 Portable Bluetooth Speaker comes with a 2-year limited warranty only when purchased from an authorized dealer including Amazon.com (indicated by ships from and sold by Amazon.com).