Audio Pro Addon T3+ Bluetooth Speaker - Grey. Listen wirelessly to high quality audio from any Bluetooth-enabled device such as your smartphone, tablet, or laptop. Enjoy music with clear treble and deep bass wherever you are. The long-lasting rechargeable battery provides up to 30 hours of playback at half volume or 12 hours at full volume. The portable speaker can also be plugged into the mains for home listening, and features a USB output to charge your phone or tablet from the internal battery. With a powerful 25-watt output and a class D amplifier, this speaker produces sound loud enough for any setting and delivers incredible sound quality with deep bass and great clarity.