Wireless Bluetooth 4.0 Stereo Handfree Sweatproof Exercise/running/sports & Gym Headset Earphone Headphone with Microphone for Android Smartphone and Other Bluetooth-enabled Tablets (Black) Sweatproof design:Good choice when people do sports or other actives.Hang like a necklace around your neck. Bluetooth 4.0 version:Easy pairing with phones, tablets and other Bluetooth enabled music devices within ten meters.can pair with 2 phones at the same time. CVC 6.0 version:Intelligent noise reduction, with excellent sound effect collection, superior sound isolation,and provides steady Bluetooth signal and support stereo music. Less time charging and long time playing:One hour for full charge, 4-6 hours holding time. Unique design:Junior lightweight,comfortable to wear,prolonged use feel tired.