Wireless Bluetooth Headsets,WONFAST Over-ear Hifi Stereo Sound Music Sport Bluetooth 4.0 Headphones Build in Mic for iPhone/iPad/Android Support TF Card (Grey/Green) Foldable Design: headphones feature a on-ear foldable design, save more space when on storage. The headphones are extendable to fit many sizes of heads. headphones are very comfortable and fit head very nicely. Stereo Sound Quality: With Bluetooth connectivity, pairing with headphone via Bluetooth took a few seconds. Up to the transmission distance of 10 meters, with strong interference, high fidelity stereo sound for great communication and music listening Built-in Microphone: Hand-free receiving call can be achieved with built-in microphone. Voice chat and call communication, it make life more enjoy via microphone function. Never worry about miss any phone call Multi-Functions:Build in Mic, could answer calls, free you hand, Equipped with 3.5mm audio port, could connect the external devices, Support TF card, compatible with MP3/WMA/WAV formats Connect the headset to phone/bluetooth enabled devices by bluetooth function(the detail usage could refer to user manual), Support bluetooth 4.1, Get a perfect audio, Much stronger signal, The max transmission distance is up to 10m, Suitable for iPhone, iPad, Android, and other bluetooth enabled digital players