Fangrui Product Details Enjoy Wireless Streaming Music - This Car Bluetooth Receiver Can Be Connected To Non-bluetooth Car Audio Systems, Home Stereos, Old Speakers, Wired Headphones Via The 3.5mm Aux Adapter; And Equipped With A Bluetooth 5.1 Chip For Stable Connection / Fast Transmission / Wide Signal Range. Just Pair It With Your Phone And Start Listening To Your Favorite Music! Up To 20 Hours Battery Life - The Working Time Of This Aux Bluetooth Receiver Is Up To 20 Hours When Making Calls Or Playing Music. And It Takes Only 1 Hours To Fully Charge The Device By Using A Type-c Fast Charging Cable (included In The Package). Connection 2 Devices At The Same Time - The Portable Bluetooth Stereo Adapter Can Be Paired With 2 Devices At The Same Time. You Can Enjoy Your Music And Worry About Missing Any Calls. Hands-free - A Built-in Microphone And One Button To Answer / Redial / Hang Up / Reject Calls, Help You Make Hands-free Calls. And The Bluetooth Audio Adapter Supports Broadcasting Voice Notification From Existed Nav