Satechi B4-FM Bluetooth Hands-free Car Stereo Fm Transmitter - Manual (Page 6)

To transfer a call from the Satechi B4 to the mobile phone
press the function key until the transfer is established.
Do the same procedure to transfer a call from the mobile
phone to the Satechi B4.
[Transfer Call]
The volume may be adjusted by using your mobile phone or
your car’s stereo.
[Volume Adjustment]
Make sure that speakerphone and mobile phone are
connected. When you play music from your mobile phone it
will automatically transfer to your speakerphone. Music will
automatically be paused when you have an incoming call.
When the call ends, the music will start playing again. Some
mobile phones may also require that you select “Play” on your
phone to resume music.
You may also plug in a portable music source (iPod or MP3 player)
into the Satechi B4 by using the 3.5mm adapter cable provided.
[Play Music]
Satechi B4’s USB Port provides +5V/1000mA output to charge
your USB powered device through USB cable (Please make
sure your device can be charged through USB). This allows you
to listen and charge MP3 / iPod at the same time.
[Charge USB Powered Devices]
Bluetooth
Everyday Use