They promoted AirPods clones, whose design may be in breach of Apple's intellectual property rights.
The executives of the four US tech giants defend their records at a five-hour hearing in Congress.
The bosses of Facebook, Google, Apple and Amazon are set to be grilled by Congress.
A headset that can measure your brain's reaction to images could improve mental health.
The video-call boom means that, months into the pandemic, it is still hard to buy many webcam models.