Multitester tested for voltage. This is genuine, factory original APPLE Mac power supply with an input: AC 100-240V (ordinary household wall plug outlet). Please determine the correct adapter for your chair before purchase. Questions are encouraged. S&H in the contiguous USA is $7.(insured shipping). Please see other interesting items for JGrit. USPS DELIVERY TIME: As stated in the item listing, seller will drop-off your item to the USPS within 4 days of receiving cleared payment. How long it takes to deliver to your door is strictly within USPS control and not within the control of seller. Please leave 5 stars for seller 4 day drop-off time.