Fangrui Product Details Product Features: 1. 3d Surround Sound Function: With The 3d Audio Button, You Can Switch To 3d Mode To Enjoy The Surround Sound With High Fidelity From A Normal Audio Source. Its Advanced Internal Chip Takes Charge Of The Conversion To Possible, Using Convenient Lossless Codes. 2.auto On:when You Connect To The Power, So Its Very Good For To Use In Car Or Other You Want It Have Auto On Functions. 3.dual Device Link: Simultaneously Pair Your Smartphone And Tablet And Stream Music From Either One With Any Stereo System That Supports A Standard 3.5mm Or Jack.connect Two Bluetooth Devices At Once To Listen To Music, Make Phone Calls, And More. 4.connect Two Devices: Support To Connect With 3.5mm Audio Port And 2 Audio Port At The Same Time. 5.wireless Music Streaming: Stereo Stream Music To Non-bluetooth Headphones And Speakers. Space-saving Design: Ultra-compact And For Convenient Use With A Variety Of Devices. Super Stable Connection: Our Bluetooth Audio Adapter Is Fitted With A Bluetooth 5.0 Chip For St