Rock out while you work out with Skullcandy Method Bluetooth headphones because the sweat-resistant design prevents them from slipping out of your ears. The flexible collar has built-in controls that are easy to use while you're on the move. - Flexible collar has built-in controls that are easy to locate and use. - Block out external sound. Headphones come with round earpiece covers that fit into the ear. - Bluetooth wireless with 9-hour rechargeable battery. Battery life will vary depending on the product configuration, product model, applications loaded on the product, power management setting of the product, and the product features used by the customer. As with all batteries, the maximum capacity of this battery will decrease with time and usage. - Skullcandy headphones come in a black swirl design.