Tips:This Product Is Only A Bluetooth Receiver, It Can Only Pair Mobile Phones, Tablets And Laptops, Can Not Pair Bluetooth Headsets Or Bluetooth Speakers. Two Auxiliary Output Ports:The Latest Bluetooth 5.2 Receivers Have 2 Aux Output Ports, As Well As 2 Aux 3.5mm Cables And 1 Rca Cable. You Can Connect The Receiver With Two Different Devices At The Same Time, Such As Home Stereo, Headphones, Speakers, Non-Bluetooth Car Audio Systems. Bluetooth V5.2 And Noise Cancellation:This Bluetooth Auxiliary Adapter Features Enhanced Signal Reception Circuitry That Can Be Connected Over Long Distances To Provide Stable And Continuous Audio Sound Quality. The Built-In Chip Has Cancellation And Anc Noise Reduction Circuitry To Make The Sound Quality Purer Sound Collection Holes And "" Buttons:This Wireless Audio Adapter Has Three Holes To Collect Better Sound, And An "" Button To Answer/Redial/Hang Up/Reject Incoming Calls To Help You Make Speakerphone Calls. It Also Supports Sending Voice Notifications From Existing Navigation Applications. You Don'T Need To Look At Your Phone While Moving. Safe Driving. Memory Function And Dual Connection:The Bluetooth Adapter Has An Automatic Connection Memory Function. Connect Successfully Once, And When Bluetooth Turns On Again, It Will Automatically Connect To Your Phone. You Can Also Pair With 2 Phones At The Same Time So You Can Enjoy Your Music Without Worrying About Missing Any Calls. 15 Hours Working Time:This Bluetooth Car Adapter Has A Working Time Of Up To 15 Hours. A Full Charge Takes Only 2.5 Hours. In Addition, The Bluetooth Music Receiver Can Be Used When Charging, Which Is Very Convenient. Product Model:B21 Supported Devices:Support Two Mobile Phone Connections Bluetooth Version:5.2 Output Interface:3.5mm Stereo Rca Left And Right Channels Function roduction:U Disk, Hands-Free Call, Nfc Connection Bluetooth Protocol:Avrcp,A2dp Frequency Range:2400-2483.5mhz Frequency Response:20hz-20khz Output Power:28mw Rl=16 Signal-To-Noise Ratio:90db Total Harmonic Distortion:0.1% Support , Aac Forward Transmission Distance:10 Meters Support Micro-Usb Interface 5v Power Supply Colour:Black Material:plastic Size:7.8x5x1.8cm Package Contents: 1 * 3.5mm Auxiliary Cable 1 * Av Audio Cable 1 * Type-C Charging Power Cable 1 * English Instruction Manual 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.