Multitester tested for voltage. This is a voltage EQUIVALENT version ADAPTER for Medela powersupply 920.7041 for pumps 5700 57000. Input: AC 120V and Output: DC 12V 1.0A (aka: 12VDC 1000 mA). Amperage can be higher, but never lower. Round barrel connector with a hollow POSITIVE center. Converter, voltage regulator, transformer, adapter used for many Medela electronic devices. Please check your device for power requirement before purchase. Photo is generic. Shape, size or color may differ from auction photo. 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 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.