Starwood Hotels & Resorts Worldwide, Inc., has launched SPG Keyless, the hospitality industry’s first mobile, keyless entry system allowing guests to use their smartphone as a key.

SPG® Keyless is available only to the members of the Starwood Preferred Guest® at all levels and they can use their smartphone to check in, get their guest room number, and even unlock the guest room door.

Application works through the SPG app, which can be downloaded for iPad, iPhone and Android. At this moment there are currently 10 properties participating and from 2015, all Aloft®, ElementSM, and W® hotels and resorts will launch SPG Keyless.

To use SPG Keyless guest must have an SPG number, a valid email address, a valid credit card and a registered mobile device, reservation must be made for only one room, reservation must be made through Starwood websites, mobile websites, the SPG apps or the customer call center.