Hilton Worldwide on Tuesday introduced a mobile app that lets guests use their smartphone as a room key.

Hilton’s Digital Key is available for HHonors loyalty members. By early next year, the feature will be available at 250 U.S. hotels operating under the Hilton, Waldorf Astoria, Conrad and Canopy by Hilton brands, the company said.

Hilton started beta-testing the feature at the Hilton Alexandria Old Town in Alexandria, Va., earlier this month.

The company said last summer that it would start retrofitting many of its U.S. hotels with door locks enabling guests to use their smartphones as room keys.

Starwood Hotels & Resorts started a similar program last year.

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