Add wireless connectivity to existing wired headphones or speakers at home or in your car. Low latency Bluetooth 4.1 with wireless range of up to 33 feet, can pair up to two devices at once. Advanced Audio Distribution Profile (A2DP) delivers crystal clear wireless audio from your mobile devices. Easily manage audio playback and calls with volume controls, multifunction button, and built-in microphone. Never even out of the packaging. Was purchased for an older vehicle to go hands free but sold vehicle prior to using the device. Super tiny and mobile. Package comes with AUKEY Receiver, 3.5mm Audio Cable, 3.5mm Adapter, Micro-USB Cable & User Manual.