Hilton Worldwide has released figures for the use of its Digital Key service, one year after it was launched.

The group says that the technology, which forms part of the Hilton HHonors app and allows members to open room doors using their mobile phones, has opened two million doors at 400 hotels.

Initially launched in the US, the service is now also available in Singapore, and Hilton says it will continue to roll it out globally during 2017.

New features are also set to be added, including the option to have multiple digital keys per room by early 2017, allowing family members and friends to all have access on separate devices.

The app – which is available via the Apple App and Android Google Play stores – also features digital check-in with room selection via interactive digital floor maps, which Hilton says is being used over one million times per month.

The group says that 70 per cent of those who use digital check-in also opt to use the Digital Key service.

Other new features on their way include an app redesign with iPad compatibility, a “Pin My Room” option to allow user to mark their favourite room at a hotel so that they can select the same one of future visits, and an in-app real times chat service connecting guests to a front desk team member.

Commenting on the news Joshua Sloser, vice president of Digital Product Innovation at Hilton said:

“With these new features, we’re reimagining the travel experience by providing solutions to challenges our guests might not even know they have yet.

“We know every guest has their preferred way of connecting with our Team Members, so we make it as easy as possible to assist them on their own terms, whether it’s through real-time chat, through social media channels or in-person at the front desk.”