***It is a value set of 20 pieces of Kato 29-352***It’s a more reasonable price than buying 20 pieces separately at our store!Decoder for head and tail lights – Transponding (Detecting Train Position) Function – 2 function circuits (each up to 125mA) – Lights switches automatically between white and red in accordance with the direction of the train – According to the direction of installation of the decoder, it determines whether the white light (head) or red light (tail) lights up – Designed for Kato DCC friendly trains (not for old trains that are not designed DCC friendly)