First Class Sound. The Serenity Plus+. What a true luxury travel headphone was meant to be, without the extra baggage fees associated with “batteries required.” Even the priciest noise cancelling headphones on the market can’t compare with the affordable, lightweight, stylish and lifelike sound of the Serenity Plus+ luxury travel headphones. Unlike other high-priced noise cancelling headphones, the Serenity Plus+ doesn’t require batteries to isolate sound, resulting in a lightweight, compact, foldable eco-friendly passive noise cancellation headphone. Serenity now. The all-new Serenity Plus+. Travel with first class sound without the extra baggage fees.