Do you have to charge both AA and AAA cells together? Then there is no need to purchase two separate chargers as this all in one charger takes care of both the AA and the AAA batteries at the same time thus ensuring that time and money is saved. Since it has a rating of 50/60Hz and a voltage input of 100 to 240 volts, it can work anywhere in the world and thus can be carried along on long journeys. With this Eveready charger combo by your side you need not ask people what the voltage and frequency rating is of their place.