Bluetooth Headsets Headphones, Sport Wireless Earphone with Voice Prompt, Perfect for Outdoor Running Jogging Walking , Compatible with Most Digital Equipment with Bluetooth 4.0 Bluetooth V4.0 wireless headset  The latest technology of CSR and backward compatibility V3.0, V2,1 V2.0 and so on. Internal integrate 80MHz RISC MCU Human ergonomics earhooks  Come with a a pair of soft and comfortable earhooks, which is suitable for wearing while doing sport Built-in 60mAh rechargeable battery - 1 hour charging time for about 200 hours standby time or about 4 hours playing time(The volume will effect the time) Stable signal transmission, 10 meters transmission distance (depend on the environment), wireless and chainless Support noise cancelling function, high quality stereo, outstanding sound create a good listening atmosphere