Vention AUX Bluetooth 4.0 Receiver A2DP Wireless Adapter for Car/home Audio Music Streaming Sound System /Bluetooth Car Kits with 3.5 mm Stereo Output Bluetooth 4.0 Technolngy:faster pairing your bluetooth devices.Get high quality audio sound for playing music and answering callsBluetooth range reaches up to 33 feet in open space without obstacles. Widespread Application:Vention bluetooth receiver is ideal for turning wired stereos and headphones into a Bluetooth-equipped system to receive signals from audio output devices ,such as iPhones, Android phones, HTC,LG,SONY,MP3 Player etc. Easy to Setup and Pair: Plug a 3.5mm audio connector into 3.5mm jack of this wireless music adapter and pair with your Bluetooth enabled devices to enjoy music,makes your car trip more relaxed and enjoyble. Ergonomic Design:Vention aux bluetooth is designed for car bluetooth,home AV systems, home stereos, headphones, automobile speakers, boats, RVS and more. Note:This is a reveiver, not a transmitter.And it doesn't turn on automatically, please long press the button about 5 seconds until the blue light flashes then connect it with your Bluetooth devices.