TREBLAB XR500 High Definition Wireless Bluetooth Headphones ——- TRUE HD SOUND AND HIGH OUTPUT SPEAKERS – Our best wireless headphones for sports use latest Bluetooth 4.1 CSR technology with cutting edge components to produce rich, CD-like sound quality. Enjoy stunningly crisp treble and strong bass in the gym or on the go and feel the added motivation and improved results. ULTIMATE HEADPHONES FOR SPORTS - Weve made the best Bluetooth earbuds for sports! Theyre eXtra comfortable and will never fall thanks to the secure fit ear-hooks. Run out