Bang & Olufsen has unveiled a new pair of Bluetooth headphones that it claims should last up to 40 hours on a single charge. The BeoPlay HX should also deliver B&O's high-quality craftsmanship, along with active noise cancellation and premium sound quality.
https://www.notebookcheck.net/The-Bang-Olufsen-BeoPlay-HX-promises-up-to-40-hours-of-battery-life-ANC-comfort-and-premium-sound.529242.0.html