For example, what to do if you want to listen to music on the go, but you do not like headphones and selling favorite sports bike to buy Honda GoldWing or Harley Ultra Glide – this is not an option. Well, then you come to the aid Cranker, tank bag with a built-in speaker and an amplifier. Works built-in speaker and amplifier on 4AA batteries. The speaker is specially tuned for optimum sound at high speeds, reproducing a very decent sound. Cranker bag is attached to the tank or using powerful magnets or straps. In addition to the amplifier and battery in the bag is a little room for various small things. Hard CD collection of rock, and it can be easily attached to the aquarium through you magnets or tie straps.