Educator CHARGER-300/400 Dual Charger for Models ET-300, ET-300-L, ZEN-300, ET-302, ET-302-L, ZEN-302, ET-400, ET-402 5 volt charger allows you to charge select Educator remote dog trainers with round charging port For models ET-300, ET-300-L, ZEN-300, ET-302, ET-302-L, ZEN-302, ET-400, ET-402 Two leads allow simultaneous charging of transmitter and receiver Note: 2-dog systems require a splitter cable in order to charge both collars plus transmitter at the same time