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Product Name: Multi function Bluetooth adapter
Product version: Standard
Product Model: C41
Bluetooth Version: Bluetooth V5.0
Battery: Do not bulit-in battery (Powered by usb charging)
Transmission Range: 10m (barrier free)
Interface: 3.5mm AUX/COAXIAL/OPTICAL
Support Protocol: A2DP/AVRCP/EDR/HSP
Product Dimension: about 104*91*25mm
Using Method: Drive free
Product Material: High strength fireproof PC
Basic Functions: Bluetooth receiver, Bluetooth transmitter, tfcard playback, key operation, digital fiber / coaxial /3.5mm input, led display.
Support Devices: All kinds of speakers,desktop computer, laptop, TV, power amplifier,projector
Product Features:
1.Multi-function Bluetooth transmitter & receiver,In TX Mode: Transfer your music from a TV, CD player, Ipod, laptop to a Bluetooth headset or stereo; In RX Mode: will transfer the music in your mobile phone or computer to the audio, so that you can enjoy HIFI CD freely The sound quality. Bypass mode: cable connection between TV and Speaker, you no longer need to plug/unplug any wires,easily switch it to other two mode.
2.Hands-free Calling & Navigation Broadcast: A built-in microphone for hands-free calls; One simple button to answer/redial/hang up/reject calls. Besides, the vikefon Bluetooth car adapter supports broadcasting voice notification from existed navigation App, you don't need to look down the phone to ensure safe driving.
3.Wireless Music Streaming: Stereo stream music to non-Bluetooth headphones and speakers.
4.Super Stable Connection: Our Bluetooth audio adapter is fitted with a Bluetooth 5.0 chip for steady pairing, fast transmission and a wide signal range (33 feet). With the 3.5mm AUX port, it can be connected to non-Bluetooth car audio systems, home stereo, wired headphone/speaker, Amplifier/Home Theater.etc. Then you can enjoy wireless Hi-fi music streaming! 
5.Auto-Connect:This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on the next time.
6.With Bluetooth antenna, So the sound transmission is more stable,no-noise, and more synchronized/low latency.
7.Upgrade to support TF card play.
8.Upgrade-KEY Button: Next song/Volume Up, Previous Song/Volume Down, Multifunction Button(MFB)
9.With LCD screen display , it's can be show mode status and bluetooth select ; more clear .
10.Note: No built in battery,So POWERED BY USB CHARGING.
11.In bluetooth transmitter mode, its support 3.5mm/digital fiber / coaxial /3.5mm input,compatible for most of devices
Standard Package included: 
1* Wireless Adapter
1* 3.5mm AUX Audio Cable
1* Optical Filber Cable Cable
1* Type c Charging Cable
1* User Manual