Foneso F10 Wireless Sport Headphones CSR Bluetooth 4.1 Earphones Workout Earbuds with Sweat Proof, Black Unparalleled stereo sound quality: It features bluetooth 4.1 + edr apt-x audio decode technology which offers incredible sound quality Pair with any 2 bluetooth devices simultaneously: Our bluetooth speaker can pair with two different devices at the same time Super standby time: With built-in 100mah rechargeable lithium polymer battery, it supports approximately 10 hours of music playing Comfortable and sporty design: Sweat proof style and flexible ear hooks that stay in place to ensure a comfort physical activity