Auto On when you connect to the power, hands-free Calling & Navigation 

Broadcast built-in microphone for hands-free calls,one simple button to answer/redial/hang up/reject calls. Stereo stream music to non-Bluetooth-Compatible headphones and speakers/Amplifier/Home music system. 

Bluetooth-Compatible 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-Compatible car audio systems, home stereo, wired headphone/speaker, Amplifier/Home Theater. 

 This Bluetooth-Compatible receiver will automatically connect to the last paired device when you turn it on the next time.

The signal transmission through aux port is more stable, faster and connection receiver is directly connected to the audio device through the wire.

Model: B27

Name: Wireless Audio Adapter

Power supply: USB

Size: 33*12*4.6mm

Functional : Receive mode

Tramsmission Distance: 10M (open area)

Connect 2 Devices at One Time, enjoy music without miss any calls. 

When pairing the second mobile phone, please disconnect the paired mobile phone from Bluetooth-Compatible. 

After the second mobile phone is paired with Bluetooth-Compatible, turn on the first mobile phone's Bluetooth-Compatible, so that both mobile phones will be paired well.

*Note: It's a Bluetooth-Compatible receiver only, not a transmitter. 

So you couldn't use it for your TV, keyboard, mouse.

Package: 1x USB 5.0 Bluetooth-Compatible Aux 3.5mm