Features: - Using latest V5.0+EDR BT technology, superior signal transmission, ultra-low power consumption. - Built-in 50mm high-quality headphone speaker, strong bass, clear mid-range, high-pitched sound. With a feeling of KTV after wearing a helmet. - Built-in high-quality anti-interference microphone, external windproof sponge, high sound fidelity. - Built-in 800mAh large capacity lithium battery, multi circuit protection, long standby and working time. - Waterproof. Support all BT devices. Hands free calling function, truly free your hands. Safe driving. - Built-in mini USB charging interface for quick and easy charging.