Key Features * Bluetooth Headset With Built-In Hd Microphone And Cvc Noise Cancellation * Built in HD and Sensitivity microphone. Idea for in car calling or working use. Perfect for Stealth Listening or watching at work.ect for Stealth Listening or watching at work. * The earphone , earbuds physically block external sound. Make you experience sound with bilateral stereo effect * Wireless range: 10 m Charging time: 40m