Specification: Product : VAORLO Product Model: B21 Supported Devices: Supports Connection Of Two Mobile Phones Bluetooth Version: 5.2 Output Interface: 3.5mm AUX Stereo/RCA Left And Right Channels Function U Disk, Hands-free Calling, NFC Connection, Bluetooth 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: SBC, AAC Forward Transmission Distance: 10m Product Size 78*50*18 (mm) Supports Multiple Audio Output Ports: Can Connect 3.5mm Headphones, Stereo System, Speakers System Support: All Bluetooth Audio Devices; NFC Enabled Devices. Specifications: Features: 1. Automatically Turns On: It Is Perfect For Use In The Car Or Other Things You Want When You Plug It In. It Has An Automatic Opening Function. 2. Dual Device Link: Pair Your Smartphone And Tablet Simultaneously And Stream Music From Either To A Stereo System That Supports Standard 3.5mm Or RCA Jacks. Connect Two Bluetooth Devices At The Same Time To Listen To Music, Make Calls, Etc. 3. Connect Two Devices: Supports Simultaneous Connection Of 3.5mm Audio Port And 2 RCA Audio Ports. 4. Hands-free Calling And Navigation Broadcast: Built-in Microphone For Hands-free Calling; A Simple Button Can Answer/redial/hang Up/reject Calls. In Addition, The VAORLO Bluetooth Car Adapter Supports Broadcasting Voice Notifications From Existing Navigation Applications, So You Dont Need To Look Down At Your Phone To Ensure Safe Driving. 5. Wireless Music Streaming: Stream Stereo Music To Non-Bluetooth Headphones And Speakers. 6. Space-saving Design: Ultra-compact, Lightweight And Easy To Use With Various Devices Package Included: 1 Set* (1 Audio Receiver 1 Receiving Cable 1 Charging Cable 1 + RCA Audio Cable)