Urbuds R01 Mini Wireless 3.5 mm Stereo Music Adapter with Bluetooth 4.1 Receiver and Mic Advanced version: Latest Buletooth 4.1 technology compatible with Android smartphones and iPhone for car and home audio streaming sound system Stereo music: CVC6.0 noise cancellation intelligently filter ambient noise, bringing high quality and clear musical journey Portable design: Mini size, compact and lightweight build to easily tuck away and take on your travel Multi-function: Pairing with two devices; Pair the last device automatically; Built-in microphone; Music or call switching, free and relaxed. Super clear and flow conversation effect.