Bluetooth Headset, Hands Free Earpiece with Two 140mah Replaceable Batteries, Compatible with iPhone, Android and Most Smartphone. (Black) Portable Bluetooth 4.1 headset adopt CSR chips. Support A2DP, high-definition sound quality, enables for the other end caller to hear your voice clearly. Not only ideal for in-car calling use, but also for enjoy music. With Two 140mAh replaceable and rechargeable batteries, one battery support 8 hours music time and 12hours talking time . Not need to worry the it will runs out of juice when you are driving or go traveling. Easy to pairing. Support voice prompt, double-click can redial last number, Incoming call report. Hold on the button about 2 seconds after pairing will into Siri. Multipoint connection. Connect two devices at the same time. Headset battery meter will automatically shows onscreen for iPhone. If you find the headset is not suitable for your ear. Or if there is any question about product, please feel free to email us. We will help you solve it.