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. This is passive noise isolating headphones, not active noise cancellation. Foldable Design and Stay Comfortable: headphones feature a over-ear foldable design, save more space when on storage. The headphones are extendable to fit many sizes of heads. headphones are very comfortable and ensure lasting comfort. Hands-free Call & 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. Note, The Microphone only works in the wireless mode. Multi-Functions: headphones have several options for listening enjoyment. Built in FM radio and you can use a TF/Micro SD card with loaded MP3 music and listen to the songs directly on your headphones. 3.5 mm Port for wired usage. Wireless & Wired Function: The headphone can be used as wired via 3.5mm plug port. Wireless can be connected via Bluetooth connection.