British technology firm Dyson has unveiled its first dedicated pair of noise cancelling headphones, as the company confirmed it was moving into audio products for the long term. The Dyson OnTrac will go on sale on August 1 for £500 ($650). The headphones will come with up to 55 hours of battery life on a single charge, Dyson said, and will be available in a range of colours, with the outer caps and ear cushions fully customisable. The UK-founded tech giant previously developed headphones as part of its Dyson Zone headset, first announced in 2022, which combined headphones with a personal air p…