Hotels have long promised guests they won't have to lift a finger. Now some are reaching to technology for those light-touch - and even no touch - experiences to keep guests coming back. All over the world hotels have been racing towards clever devices, robots and voice assistants.

As tourists criss-cross the world in increasing numbers, these services are seen as a way to keep globetrotters coming back for more. Big hotel groups especially are finding state-of-the-art technology provides guests both instant gratification and greater control over their experience.