Kinivo BTC8 Bluetooth FM Transmitter - Manual (Page 4)

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(2) Adjust volume
(3) Remotely control pause/play
(4) Remotely control previous/next song
c) FM transmitter:
i. Transmit calls or music to the car’s FM radio
ii. Adjust transmission frequency
iii. Adjust volume
d) Line in and Line out:
i. Line in—Transmit music to BTC8 from a music
playback device with a 3.5mm audio cable
ii. Line out—Transmit calls or stereo music from BTC8 to
the car’s stereo system with a 3.5mm audio cable
instead of using the FM transmission.
e) USB Charging Socket:
BTC8 has a USB charging socket which provides DC 5V
voltage for charging other devices.
Note: If you want to charge other devices using the USB
socket, the cigarette lighter socket needs to provide 400mA at
least.