Blaupunkt BT01, 40 mm speaker produces audio output of 3 watts in crystal-clear detail, covering the high, mid and low frequencies. Its 400 mAh battery offers up to 4 hours of playback time. Make conference calls in your car, office, bathroom or kitchen using this speaker, thanks to its built-in microphone. The wrap around silicon cover means it’s scratchproof and can take a lot of knocks and round design makes it easy to carry around! You can carry along this compact speaker with you and enjoy music anywhere you want. It can easily fit in your luggage, backpack, bag, etc.