Dual Pairing Wireless Bluetooth 4.1 Audio Music Receiver Dongle Adapter for Shelf Stereo System Portable PA System Speaker Headset Headphone Soundbar Preamplifier Boombox and more Bluetooth 4.1 Technology- Support dual devices connection simultaneously and transform your older audio devices to be Bluetooth-capable Superior Sound Quality - Noise Elimination & Echo Cancellation technology keep the stereo sound pure and clear Built-in Battery - Provide up to 10 hours play time after fully charged Easy to Install - Simply plug it in to your stereo then connect to your devices with just press of the button Universal Capability- It support Speaker, Amplifier, boom box, headphones, car audio system, portable PA system, Sound bar or any audio device with analogue audio output. The included RCA cable and aux cable help the connection easily.