Fangrui Product Details 1. M02 3.5mm Aux Car Audio System Wireless Adapter Car Bluetooth Hands-free Call Spring Cord 2. Transform The Traditional Speaker Into A Wireless Audio System 3. Bluetooth 5.1 Signal Stable Transmission Does Not Lag, Listen To Music And Call More Smoothly 4. High Elastic Tpu Spring Cord Design, 0.3m-1.2m Free Expansion, Anti-winding, Not Messy 5. Connect The Mobile Phone To The Car Audio, Expand The Volume And Broadcast In Real Time, Concentrate And Drive More Easily 6. Built-in Noise-cancelling Microphone For Precise Sound Reception, High-definition Calls, Safer Driving 7. Specifications: 8. Model: M02 9. Bluetooth Version: 5.1 10. Output Interface: 3.5mm Audio 11. Transmission Distance: 10m 12. Signal-to-noise Ratio: Greater Than Or Equal To 90db 13. Frequency Response: 20hz-20khz 14. Material: Zinc Alloy 15. Line Length: 0.3m-1.2m 16. Power Supply: Usb2.0 17. Main Functions: Car Bluetooth Audio Receiver + Call [built-in Isolation Ic, No Current Sound]