Multitester tested for voltage.This is avoltage EQUIVALENT power adapaterpowersupply for the SmartModem 2400 with an INPUT:120VAC and OUTPUT: 8.5VAC 1350mA. Amperage can be higher but never lower. Please be sure you see a THREE PIN prong plug hole in the back of your modem. Photo is generic. Shape, size or color may differ from photo. S&H in the contiguous USA is $6.(insured shipping).Please see other interesting products by JGritUSPS 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 strictlywithinUSPS control and not within the control of seller. Please leave 5 stars for seller 4 day drop-off time. Thankyou.