Features: BT 4.2 technology, fast connection, compatible with almost all BT-enabled audio devices, enjoy wireless music. Support FM radio, TF card and U drive reader function, allowing you to listen to music anytime, anywhere. High-quality material ensures water-proof, shock-proof, dust-proof, with LED flashlight, perfectly fit for outdoor activities. Built-in high-definition microphone enables you to receive calls easily and makes your hands free. Built-in 1800mAh rechargeable lithium battery ensures up to 4 hours of music play time, offers emergency power supply to smartphones via USB port.