Everstart Enersys Exide Battery Desulfator (6 or 12 volt) US Parcel Post Mail shipping on all orders (typical arrival in 2-3 days) FREE shipping to all United States zipcodes, including Guam and US Virgin Islands Automatic voltage detection for use with 6 or 12 volt batteries Works with all types of lead based batteries, Sealed(SLA)/Gel/Deep Cycle Marine Our product is 100% made in the USA