Multitester tested for voltage. This is a

Genuine Boston Acoustics AC Power Adapter DM1203A0-1AN

 with  an input: AC 115VAC and  AC output: 12VAC 3000mA (12volt AC 3.0A). Round barrel connector with a hollow center.

This item will not fit in a small flat rate box. Special heavy wrapping is provided. S&H in the contiguous USA is $6.(insured shipping).

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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. Thankyou.