Moudio M100 Wireless Stereo Bluetooth Smart Headphones, Activity Calorie Tracker, Fitness Monitor, Sports Headset, Music Streaming, Noise Reduction & Hands-Free with Android and iOS APP (Pink) Bluetooth 4.0 chips hardware configuration ensure Hi-Fi CD quality stereo music sound and strong signal can provide no-lag voice when listening to music or calling with Mic Moudio M100 stylish behind-head design guarantee 100% stable and comfortable user wearing experience for running, jogging, biking, fishing, camping, hiking and other outdoor sports Built-in rechargeable Lithium battery lasts up to 20 hours talking time or up to 16 hours music playing time, universally compatible with most Bluetooth-enabled phones. Works with iPhone, iPad, Android Smart Phone Free Moudio APP from Apple Store and Android APP Store, Real-time record of your daily activity data, Fitness Monitor, activity record of your sports or exercise Moudio APP requires Bluetooth 4.0; IOS APP requires iPhone 4S or above and iOS 7 or above, Android APP requires BLE and Android 4.3 and above