From monitoring vital signs to filtering filthy air and even translating speech into other languages, the coronavirus-fueled boom in mask-wearing has spawned an unusual range of high-tech face coverings.
As masks become the norm worldwide, tech companies and researchers are rolling out weird and wonderful models to both guard against infection and cash in on a growing trend.
One of the wackiest comes from Japan, where start-up Donut Robotics has created a face covering that helps users adhere to social distancing and also acts as a translator.
The "C-Face" mask works by transmitting a wearer's speech to a smartphone via an app, and allows people to have a conversation while keeping up to 10 meters apart.
"Despite the coronavirus, we sometimes need to meet directly with each other," Donut Robotics chief executive Taisuke Ono told AFP.
The lightweight silicone device could have immediate benefits for people such as doctors who want to communicate with patients from a distance, the company says.