Features: [BT 4.2] This speaker supports BT device with A2DP function. Integrated with BT, it can be connected with BT devices within 10 meters. [Multi-functional Speaker] Multi-functional speaker allows to switch modes between BT mode, TF card mode, USB disk mode; Line in mode, FM mode. Multiple modes for music enjoyment. [High Fidelity Sound Quality] Enjoy crisp and clear audio with impressive 360Surround Sound powered by two 5W acoustic drivers. [Hands-Free] Equipped with a microphone for hands-free calls, you can answer or end the phone by pressing the button on the phone or on your stereo. [Endurance Time] Safe and rechargeable lithium 1200 mAh battery offers about 5-8 hours of music time depending on music volume.