Bluetooth 4.0 Wireless Sport Headphones Sweatproof Running Gym Exercise Earbuds Car Hands-free Calling Headsets w/ Microphone and High-Fidelity Stereo Sound for Smartphones Bearded Blue Certified: Exercise Tested Top Bluetooth Accessories for Smartphones Bluetooth 4.0 with built-in microphone for handfree calls and noise reduction. Exercise and Sweatproof design with 100% stability and comfort. Talk time up to 10 hours and Playing time up to 8.5 hours. Quick pairing and skip-free music in a 10-meter working distance.