Blaupunkt BT03 RGB , 52 mm speaker produces audio output of 5 watts in crystal-clear detail, covering the high, mid and low frequencies. Its 800 mAh battery offers up to 4 hours of playback time. It has built in Dynamic RGB lights that change colour, Honestly, it looks great when the lights are dimmed and the LEDs are working their magic. Make conference calls in your car, office, bathroom or kitchen using this speaker, thanks to its built-in microphone. 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.