The fans de-pollute and cool the air meaning the mask does not need a tight seal against the face.
Sony, Samsung and LG all had secrets to unveil at the technology expo in Las Vegas.
Samsung's SelfieType scans finger taps on a table using the smartphone's front camera.
A special 8K TV at the CES tech show allows scenes to be re-lit as they play.
A deep-pocketed new streaming service has revealed it will launch in the US on 6 April.
Quibi has raised $1bn (£763m) in funds and commissioned some of Hollywood's biggest names to make content for its mobile-only service. Each show will be 10 minutes or shorter.
The firm intends to charge $4.99 (£3.80) per month for basic access and $7.99 for an ad-free version.
But one industry-watcher questioned consumers' willingness to pay.
After five years in development, the makers of a circular phone say it is nearly ready for launch.