Features - Built-in high-quality anti-interference microphone, external windproof sponge, high fidelity. - Support up and down music, volume increase and decrease, playback pause, automatic callback, and other functions, simple operation, and easy to use. - USB charging interface for quick and easy charging. - Small and lightweight, easy to carry. - Suitable for Full face helmet or half face helmet, off-road helmet, flip helmet. - Phone Call Handsfree, easy to use - One-click for answering and ending phone calls (Long press 2 seconds to Reject) - Automatically answer incoming calls in 5 seconds - Auto Power OFF within 5 minutes when Bluetooth disconnected, 100 percent release your hands - CSR Professional Bluetooth V4.2 Chipset - Qualcomm CVC 6.0 audio technology, the other person can clearly hear your voice when calling - Qualcomm Kalimba DSP noise cancellation, you can hear clearer sound through the speaker - Talk-Time Extension, more than 20 hours talking time - A2DP V1.2, Better performance on Viber or WhatsApp or WeChat or skype online talking - Support 2 phone Bluetooth connections - Waterproof Design, No fear of rain and sweat - Low power consumption - 500mAh Battery Inside, standby time >180 hours Note : - Do not support intercom function. - Only support Bluetooth handsfree calling function