What’s the difference or advantage of OWS 2?

oladance is the world’s first company who make open wearable stereo with a unique battery behind the design. This innovative design provides several advantages. Compared with commonly used in-ear earbuds, it has all the benefits of open earbuds, like letting you hear the surrounding sound while listening to music, reducing hearing loss, and is comfortable for long-term wear. Compared with normal open-ear headphones, its special design provides better balance and tight fit for sports, better sound quality, and tripled battery life of up to 19 hours per charge and up to 94 hours with the add-on charging case.