This 5 volt charger allows you to charge your Educator Pro and Easy series remote dog trainer, models EZ-900, EZ-902, EZ-903, EZ-904, PE-900, PE-902, PE-903. Two leads allow simultaneous charging of transmitter and receiver. Note: 2-dog systems require model SPLITTER-002 splitter cable in order to charge both collars plus transmitter at the same time.