Wide compatibility: Bluetooth 4.1 Receiver compatible with most smartphones, ideal for home or vehicle audio systems. But please do not attempt to connect the gadget to such as Bluetooth headphones or Bluetooth speakers, this is totally meaningless since the gadget functions as a Bluetooth receiver for those devices without Bluetooth feature itself but desire to receive Bluetooth signal. Double link: Connect two Bluetooth devices at once; freedom to enjoy music, GPS or answer phone calls. Control it: Change the volume, play/pause music, or skip tracks with ease; Apple devices can even activate Siri with the click of a button.