best if used in the usa only [SEP] in this day and age when almost all portable electronic products are universal power based i regret to inform you that the norelco trimmers are mono voltage and cannot be operated outside the us the unit can be charged only from neither the philips nor the amazon websites point this out to buyerssince i travel outside of the us quite a bit it is a big hassle to use this trimmer with a voltage converter i wish philips would seriously consider this issue and improve on the product hence two star rating