GOLDSTEIN STAR Wireless Ear clip on Bluetooth Supports two or more mobile phones connected. Long battery life, fast charging Bluetooth Profile A2DP/ high-quality stereo audio transmission and remote control protocol. Powerful noise cancellation circuit. (Active Noise Reduction.) Charging time is about 1 hour. (Power Indicator Charging: blue light lights, fully charged: blue light goes out.) Bluetooth Version 4.0 Play Time up to 7h and standby time up to 7 days and Bluetooth Range ( up to 10 m ) with one charging cable. Compatible with Android.