Nothing has decided to slowly drip product teasers ahead of launch, and the latest in line are a pair of over-the-ear headphones. A first for the brand, the Nothing Headphone (a) will launch alongside Nothing Phone 4a (and, potentially, other products) on March 5, during this year's Mobile World Congress in Barcelona. SEE ALSO: The Nothing Phone 4a will be available in pink, and we have pictures and a video The company revealed very little about the headphones, besides saying that they'll come in "bold colourways" and deliver "the longest battery life of any Nothing audio product to date." One of those bold colourways is seen in the first teaser image shared by Nothing (see above), a fancy shade of yellow. Given Nothing's trademark semi-transparent product designs, we're pretty excited what the company will do with the new headphones. Nothing actually offers a couple of earbuds, as well as full-sized headphones, including the Nothing Headphone 1 and Nothing Headphone Pro.…