The first stick could be used only with difficulty. The USB connector is built much too close. When pulling out the USB plug broke then from its housing. "Ect ideal for devices such as sticks. That need to be changed quickly" From out of the question. The ball is only for use on flat sticks without housing (eg in the form of key or meZmory GreatGadgets). In addition, the supplied ball sent does not match the product pictured. Got to contradict a refund. However, the broken stick is my problem.