Portable Bluetooth Headphone Features: - OE 101BT - High Fidelity Audio Playback - 40mm Optiflex Speaker Drivers - Frequency Response 20Hz - 20KHz - Powerful Deep Bass with Sharp Vocals & Crystal-Clear Treble - Comfortable Heat Dissipating Ear Cushions - Hands-free Talking - Make and Receive Calls - Convenient Head Mounted Answer Button - Bluetooth - Wireless Music Streaming - A2DP Support - Works Up to 10M - High-end Bluetooth CSR Chipset - Built-in Battery - 300mAh Battery - Standby Time Up To 300 Hours - Talk Time 8 - 10 Hours - Charging Time < 3 Hours What's in the box 4897038378296