Don't let the price fool you. Back Bay Audio rigorously tuned the Duet 50 Slims to have all the sound quality of more premium earbuds at only 1/3 the price. It features the classic "American Hi-Fi Sound," strong bass, relaxed, natural midrange, and crisp highs. The built-in microphone allows hands-free calls, and the wireless controls allow navigation without ever touching your phone. With a total of 30 hours of battery life, the Duet 50 Slims are in a class of their own! The earbuds can play 8 hours of music in a single sitting, and the charging case can power 22 more hours of music on the go. The Duet 50 Slims are also IPX5 waterproof, meaning they're completely unaffected by sweat or rain.