LEFF Amsterdam Portable Speaker Tube Audio LT70011. Together with Piet Hein Eek LEFF amsterdam came up with the idea that if you have a clock on your bedside cabinet, a speaker might be nice alongside it. So they designed a bluetooth speaker in the same shape as the Tube Clock. You can connect the portable speaker to your mobile phone, tablet etc. through bluetooth and listen to your own music. The Tube Audios compact size and long lasting battery make it the perfect portable speaker. It has the best components available and gives an extraordinarily good sound for such a small object.