Audiosharp AS1208 Foldable Wireless Bluetooth 4.0 NFC Stereo On-Ear Over-Head Headphone with Built-in Microphone Mic and Volume Control (Black) With NFC chips allows easy Bluetooth pairing to NFC compatible devices, it also guarantees complete wireless freedom. Thanks to the CSR Bluetooth 4.0 dual-core chips, it provides a high-definition sound experience, also a standby time up to 10 hrs. Use of the built-in mic supports multiple Bluetooth device, e.g., computer, mobile phone and tablet. The 40mm pronouncing unit serves up more clear and richer performance in sound. Its foldable design allows it to cuddle right after in its own storage pouch.