Multitester tested for voltage. This is a voltage EQUIVALENT wall mount version of the ROLAND Boss voltage regulator, power supply, powersupply, inverter, adaptor AC input 120V (ordinary household wall outlet). Amperage can be greater, but not smaller. Used for MC-303, TB-303, SH-101, TR-606 midi synthesizer and other devices. Please determine compatibility before bidding. Round barrel connector with a NEGATIVE center. Photo is generic. Shape, size and color may differ from photo. Questions are encouraged. Special heavy wrapping is provided to protect the prongs. S H in the contiguous USA is $6.(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.