Instruction Manual

Car Wireless FM Transmitter
(With BASS Sound Enhancer)
Dual fast charging protocol using QC3.0 and PD
USER MANUL
Model: C73
1 Microphone
2 QC3.0 fast charge (DC 3.6-6.5V/3A, 6.5-9V/2A, 9-12V/1.5A)
3 U disk (maximum 64G)/5V-1A charging output
4 Type-C fast charge PD 18W fast charge protocol (DC5V/3A,
9V/2A/12V/1.5A)
5 Yellow LED display
6 Phone button (Long press for 2 seconds to enter FM mode. In the off
state, long press for 3 seconds to turn on. In the power on state, long
press for 3 seconds to turn off)
Five-way button: Click pause/play/hands-free (answer/hang up/reject).
Left dial the previous song
Right dial next song
Up dial volume plus V+
Dial down volume to reduce V-
7 Switch button: In music mode, click to switch audio source mode (U
disk/Wireless mutual switching)
In working state, double tap to wake up Siri / Google
voice assistant
In working status, long press for 3 seconds to turn off
FM, screen, Wireless, and keep charging
8 BASS sound enhancement button
Packaging accessories
●
FM transmitter*1
●
Instruction manual*1
Features:
Adjust the channel of this unit to the car radio channel to be the same,
you can transmit U disk music to the car stereo to play, and connect to
the mobile phone Wireless can realize the Bluetooth call hands-free
function through the car stereo
Parameter
Product name：C73
Effective distance：5m
U disk format and capacity: FAT32 format, maximum support 64G
FM frequency range：87.5MHz-108.0MHz
Compatible audio format：MP3.WMA.WAV.FLAC
Compatible with Wireless protocol：A2DP/AVRCP/HSP/HFP
Orange fast charging port supports QC3.0 Protocol：(DC 3.6-6.5V/3A,
6.5-9V/2A, 9-12V/1.5A)
Type-C port support: PD18W fast charging protocol：(DC5V/3A, 9V/2A,
12V/1.5A)
Power on/off
Turn on: Insert C73 into the cigarette lighter hole of the car. After the
car is started, the yellow display will automatically turn on and flash
once per second. If it is off, long press the " " button for 2 seconds to
turn on C73
Shutdown: Cut off the power to shut down or long press " " for 3
seconds to shut down
Note: Even if C73 is turned off, the charging port can still work normally
Screen display
1. After power on, the yellow display shows bt and frequency flashing
alternately
2. After the pairing is successful, the screen displays bt will be on
3.Long press the " " button to enter the frequency modulation
mode (display digital frequency)
2.Wireless hands-free function
A. Answer the call: Click the " " button.
B. Hang up the call: Click the " " button.
C. Last replay: Double click the " " button.
D. Reject the call: Long press the " " button for 2 seconds.
E. Switch private calls: Press and hold the " " button for 2 seconds
during the call.
3. Music function (please make sure the connection is successful
before use)
3.1.1 Audio source: Wireless/U disk
3.1.2 Music sound effect: b button (red), during music playback, click the
b button to turn on the b1 bass surround enhancement effect, which
will strengthen the music surround bass effect, suitable for dance
music, DJ, RAP, and other heavy bass songs. (For light music, please use
b0 sound effect, click the b button to restore)
A. Wireless mode: Refer to the instructions of the smart device.
Such as phone. After the Wireless connection is successful, the music on
the smart device can be played and synchronized to the car's built-in
speaker
B.U Disk Mode: Plug in the U disk, C73 will automatically recognize and
play the music inside
Note: To ensure a better experience of the product, when using this
product, please select only one audio source.
3.2. Audio source selection
A. Used between Wireless and U disk, it will recognize the last
connected device to play by default.
B. Auto-play option via U disk: plug and play.
C. After power off or restart, C73 will enter the previous playback mode
(automatically play music in U disk mode, and manually play music in
Wireless mode
D. In the music mode, click " " to switch between Wireless and U
disk devices, seamlessly switch the audio source selection, choose your
favorite music more quickly, and enhance the pleasant driving
experience.
3.3. Audio playback operation
A. Play/Pause: click " "
B. Previous song/Next song: Left dial phone key " " is the previous
song, right dial phone key " " is the next song
C. Volume increase and decrease: dial up the phone key " " for
volume V +, dial down the phone key " " for volume V-
4.Voice assistant
4.1. Double-click the switch key " " to start the voice assistant
4.2. Double-click the switch key " " to exit the voice assistant
5.QC3.0 charging port description
5.1. For devices that do not support QC3.0 fast charging, the maximum
output is 5V/2.4A.
5.2. Smart devices that support QC3.0 fast charge, meet QC3.0 fast
charge protocol: DC 3.6-6.5V/3A, 6.5-9V/2A, 9-12V/1.5A.
6.Type-C charging port description
6.1. For devices that do not support PD fast charging, the maximum
output is 5v/2.4A
6.2. Devices that support PD fast charging, meet PD 18W fast charging
protocol: DC5V/3A, 9V/2A, 12V/1.5A. (Please use C to C data cable, or C
to C lighting data cable to insert and use)
7. Frequently Asked Questions (Block Diagram)
7.1. Noise problem
Solution:
User's guidance
1. FM and Wireless pairing
Note: In order to let you enjoy higher-quality music, you need to adjust
the blank frequency of C73 to be the same as that of the car (non-local
broadcast channel) when using it for the first time. Every time you use it,
please make sure that the frequency between the transmitter and your
car is the same (not the local broadcast channel).
1.1. Turn the car radio to a blank frequency point (that is, a channel
without any broadcasting). The reference is: clear rustling,
1.2. Long press the " " button for 2 seconds, the number flashes, and
it enters the FM mode. Flick left and right to increase or decrease the
frequency and adjust to the same frequency as the car radio, such as:
FM88.8. Click the " " button again or wait 3 seconds to exit the FM
mode
1.3. Wireless connection:
A. After powering on, the screen of C73 displays HI, and then displays
the current car battery voltage. After 2 seconds, it enters the bt state,
which means it enters the pairing state, waiting for pairing
B. Turn on the Wireless of the smart device, search for "C73", and then
connect. After connecting, the screen will display bt long on, and you
can play music via Wireless. Usually the connection will be automatically
paired but sometimes it will ask you to enter a password. If prompted,
enter the initial password "0000".
(When used for the second time, C73 will connect to the last device
connected last time.)
①
③
⑤
⑥
Product details
④
②
⑦
⑧
C73
A. Reduce the volume of the speaker by one third and increase the
volume of the smart device
B.Signal interference. Please switch to another empty white frequency
point
7.2. The other party cannot hear you during a call
Reason 1: The dialing method is wrong
solve:
A. Click the C73 phone button " " to answer the call through the
speaker in the car when there is an incoming call
B. Activate the phone speaker to answer the call
Reason 2: The call volume is low
solve:
A. Increase the volume of the phone
B. The volume of the other party is too low during the call, just ask the
other party to increase the volume
Reason 3: The microphone is broken
Suggestion: Contact customer service for help
(Waste electrical & electronic equipment)
The label on the product or literature indicates that it cannot be
disposed of with household waste at the end of its useful life
To prevent the impact on the environment or human health caused by
improper waste disposal, please separate this from other wastes and
recycle them to promote sustainable development
Friendly reminder:
After receiving the product, do not rush to insert the product into the
cigarette lighter jack of the car. After starting the car, first turn on the
idle FM radio and patiently select a blank channel with no local
programs on the car radio. The standard is a slight rustle. Then insert the
product into the cigarette lighter jack and adjust the FM frequency of
the product to be the same as the FM frequency of the car. At this time,
the car radio will be very quiet, without static electricity interference. (If
it is still not quiet, please try to find a new blank channel again), and
finally connect to your phone via wireless. When they are successfully
paired, you can listen to songs on your phone and make hands-free
calls on your phone.