The original 1/8" to 1/4" adapter is included. If you're familiar with Grado, then you're familiar with the openness, airiness, yet substance of these headphones. They are crisp, full, and provide an amazing sound stage. These are low-impedance headphones so no external amp is required for proper use. The item "Grado SR325e Audiophile Headphones with All Original Packaging Mint Condition" is in sale since Tuesday, September 24, 2019.This item is in the category "Consumer Electronics\Portable Audio & Headphones\Headphones". The seller is "telcovebob" and is located in Mooresville, North Carolina. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South africa, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, New Zealand, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Uruguay.