My user manual (ASPIRE 5741 laptop) claims that this device can be used with either 110 v or 220 input. Is there any way i can validate that claim, and if it is true, how would once switch between 110 and 220 (excluding the use of an external 500 watt transformer). Brookline, Vermont USA. A direct response to my e-mail would be helpful. [email="nbs-ch@live.com"]nbs-ch@live.com[/email]