Amazon is reportedly developing a pair of smart glasses that work with its Alexa voice assistant.

The glasses could let wearers summon Alexa - best known for featuring on Amazon's Echo speakers - at any time to answer questions and conduct tasks such as ordering a taxi.

Amazon's smart assistant will sit within a regular spectacles frame that has a bone-conduction audio system, according to the Financial Times. The advanced technology would mean users can hear Alexa without having to wear headphones.