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Multitester tested for voltage. This is a voltageEQUIVALENT wall mount version of theROLAND voltage regulator, power supply, powersupply, inverter, adaptor AC input 120V and DC output:9 volt0.5A (aka: 9VDC 500mA). Amperage can be greater, but not smaller. Used for MC-303, TB-303 synthesizer and other devices. Please determine compatibility before looking. Round barrel connector with aNEGATIVE center. Photo is generic. Shape, size and color may vary slightly from photo. Special heavy wrapping is provided to protect the prongs. S&H in the contiguous USA is $5.(insured shipping).Please see other interesting items 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.