Multitester tested for voltage. This is a voltage EQUIVALENT version adapter for the CYBER ACOUSTICS subwoofer CA3892 and other LABTEC power supply unit with Input: ac 120V and Output: dc 15V 1200mA (aka: 15 volts DC 1.2 amps). Amperage can be higher, but never lower. Round barrel connector with a NEGATIVE hollow center. Converter, voltage regulator, transformer, adapter used for many devices. Please check your device for power requirement before purchase. Questions are encouraged. Photo is generic. Shape, size or color may differ slightly from photo. Special heavy wrapping is provided to protect the prongs. S H in the contiguous USA is $8.(insured shipping). Please see other interesting items by JGrit. USPS DELIVERY TIME: As stated in the item listing, seller will drop-off your item to the USPS within 5 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 5 day drop-off time.