Most speakers are unidirectional, meaning the best sound is only directly in front of the device. Because the Audio Cube uses omnidirectional speakers, the sound penetrates air space, without any dead spots. This creates a 360º audio experience,where the sound interacts with the room. The white Audio Cube has an internal 4800 mAh battery allowing it to be portable, playing for up to 12 hours without recharge. Delivery Time: 2 working days.