Lightweight. Barely 1 oz, probably lighter than your keys. Discreet. Behind-the-head wearing style. Wireless music stream from your compatible phone or iPod. Never miss a call. Music mutes or pauses when calls come in. Control music and calls from the headphones. Stable and secure fit. Small 13mm speakers for better comfort and fit on the ear. Durable: sweat and water resistant for active conditions. Long play time: up to 6 hours of music play from a single charge. Works with any brand of Bluetooth-enabled compatible phone or music device that supports.