Bluetooth 4.1:Offers you a stable signal. Compatible with almost all smartphones. Bluetooth working range 33ft (10meters). USB interface, 18/17 hours talk/music time, Power and volume buttons are easy to access and control. Portable Bluetooth headset for women and men, perfect for office, business, driving, travel, workout, gym, walk, run or any sport High Quality:luetooth earbuds are made of strong durable soft plastic, fit any ear perfectly. Adjustable to 270