Acadia National Park passes are now available online.

Annual and seven-day passes are being sold at in a pilot program at Acadia National Park.

U.S. Sen. Susan Collins and Sen. Angus King announced the new option Tuesday. Last year, the two sent a joint letter to the Department of the Interior and the National Park Service asking for the service.

“Electronic park passes will not only make it easier for the American people to visit and enjoy our most treasured places, but they’ll also help the Park Service maximize sales and generate new revenues,” King said in a statement.

Park passes purchased online can be printed or stored on a mobile device for park service staff to scan at the park’s entrance. Over the next few months, the program will be expanded to include Colorado National Monument near Grand Junction, Colorado; Theodore Roosevelt National Park in the badlands of western North Dakota; Everglades National Park in Florida; and San Francisco Maritime National Historical Park.

“This will improve convenience for visitors and enhance accessibility to one of our country’s most beloved and visited national parks, while ensuring that entrance fees are captured to support park improvements,” Collins said in a statement.

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