When you’re working with colleagues in an open office space, it can be really difficult to go “heads down” and get work done. Even if you strap on some headphones and play music to drown out ambient noise, your co-workers may still walk over and try to speak with you.

The $28 Luxafor Flag offers a unique and compelling way to let others know you don’t want to be disturbed. Made by a Latvian company named Greynut, this small USB light attaches to the back of your laptop lid or to the side of your monitor and lights up red, green or one of several other colors. This signal lets your office mates know whether you have time for them. I used the device for several weeks in our open-area news room, and found that, while the Luxafor Flag gets the message across, people often ignore it.
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https://www.laptopmag.com/reviews/accessories/luxafor-flag