1. Bluetooth 5.0 Adapter: Strong Compatibility, Universal For , Computers, Headphones, Mice And Keyboards, Suitable For Home Audio And Video, Cars And Offices, Etc. 2. Bluetooth 5.0 + : More Compatible, More Stable Signal Transmission, 10 Meters Barrier-Free Transmission 3. Transmission And Reception 2-In-1: One Adapter Dual-Mode, Meeting Both Sending And Receiving Functions 4. Free Driver: Plug And Play, Free Driver Installation, Quick Pairing, Very Convenient To Use 5. Ordinary Speakers Are Upgraded To Bluetooth, With Built-In 5.0 Bluetooth Chip, Smart Compatibility, And Built-In Memory Chip. After Connecting Once, Subsequent Connections Will Be Made Automatically Without Manual Effort. Interface: 3.5mm USB Transmission Rate:3Mbps (Mbps) Working Frequency:2.4Mhz (Mhz) Whether Plug And Play:Plug And Play Effective Working Radius:10m Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:Black Material:ABS Size:About:30x18mm Package Contents: 5 * Audio Receiver 5 * Audio Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.