This 10 volt charger allows you to charge your Educator and Einstein model ET-400TS, ET-402TS, ET-500TS, ET-502TS, ET-700TS, ET-702TS, ET-800TS, ET-802TS, ET-1200TS and ET-1202TS dog trainers. 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.