mosmos
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Both Newstar 100W & Super 120W will work.molecule said:can confirm that the step down transfomer simply steps down the voltage from 220->110? I'm thinking of ordering a 5xx roomba from USA thru a friend, any new voltages or transformer size I need to consider or will the Newstar 100W / Super 120W work as well?
@thewiseone do u leave yr transformer/charger on 24h?

i got thought of the battery too.