https://www.theregister.co.uk/2017/09/18/jabra_evolve_80_noise_canceling_headphones/

EARS-ON TEST The Register's Sydney eyrie will soon be demolished, so Vulture South needs a new office and we're probably going to nestle into a shared workspace.

Which is why I decided to try out the Jabra Evolve 80, a pair of noise-canceling headphones that feature red lights on the earpieces designed to warn people you do not wish to be disturbed.