There are two types of color timers: one that only lights up when batteries are inserted (2 pieces), and another that lights up and makes sounds (2 pieces). The outer cases can be swapped. There are also minor scratches and yellowing due to aging. Batteries will be removed before shipping. The type that only lights up has no batteries and its operation has not been confirmed. The bracelets and rings can also be swapped (photo 4). Please purchase if you understand that this is a used item. ☺︎