NX-8252 Bluetooth Headphone Fold High Fidelity Surround Sound Wireless Stereo Headset with Mic (Blue) 1. Wireless Bluetooth foldable, adjustable headphone Vs bluetooth3.0+EDR. 2. Adjustable headband for comfort and secure fit. 3. Equipped with audio cable, the receiver can be used as a wired earphone. 4. 3.5mm plug, compatible with MP3, MP4, PC, PCD, DVD and most smartphones. 5. Rechargeable, high quality lithium ion battery ,working time:10 hours.