Ecandy Wireless Foldable Bluetooth Stereo Headphones with Noise Cancelation Microphone & Rechargeable Li-ion Battery (Black) Wireless Bluetooth Foldable Adjustable headphone vs Bluetooth4.0,can connect two phones simultaneously Stetchable and foldable headband,curving head-style design. Built-in microphone and speaker. Rechgarable ,high quality lithium ion battery ,working time:7 hours.