User's Manual

User Manual
F4 noise-cancelling headphones
F4
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1. Opening the charging case
will automatically turn on the
earphones. The earphones
will quickly emit a blue light
and then enter into pairing
mode.
2. Turn on your phone’s
Bluetooth and look for “F4”
on the device list. Tap on it
to start using the earphones.
Initial Usage
1. Auto-Disconnect
Put the earphones inside the charging
case and close the case to enter the
charging mode. Bluetooth will be
automatically disconnected.
2. Auto-Reconnect
After the initial usage, you can
subsequently use the earphonesby
simply opening the charging case. The
earphones will automatically reconnect
to your phone even before you take it
out of the case.
Subsequent Usage
Note: After opening the case, if the earphones are
not taken out, they will turn off 5 minutes later.
Before using the item for the very first time, it is recommended
to place the earphones inside the case and charge them until
they reach full charge. The included USB Type-C cable should
be used for charging.
Charging case
power display
Right earphone
power display
Charging case
strike plate
Left earphone
power display
Smart Monitoring Display of Charging Case
Left earphone power display: There are 4 cells in total, each cell can hold up to
25% power, for a total of 100% when fully charged.
Right earphone power display: There are 4 cells in total, each cell can hold up to
25% power, for a total of 100% when fully charged.
Smart Charging
1. Earphone charging: Put the earphones inside the charging
case and close the cover. They will automatically enter charging
mode. Whileany of the earphones (L / R) is charging, the red
light willstay on. The slots inside the charging case correspond
to the earphones (L / R). At full charge, the light on the
earphones will turn blue, flash for 15 seconds, then enter
standby mode.
2. Charging just the Case: After inserting the charging cable
into the USB Type-C slot on the case, the case will automatically
start getting charged. The LED screen will display an incremental
change of power from 0 to 100 during charging. 100 indicates
full charge.
Note: When the earphonesarebeing placed inside the charging
case, this should be done smoothly with just a gentle push
so as to prevent the earphones from being in poor contact
with the charging probe, which may result in failure to
charge.
Operating the various Buttons & Keys
Multi-function
button, press to:
play/pausemusic,
answer calls,hang-up, etc.
Side buttons, short press:
"+"to increase volume
"-" to reducevolume
Side buttons, double-press:
"+" to skip to next song
"-" to skip to previous song
Multi-function button,
long press:For 3 seconds
to turn offFor 6 seconds to
turn on
Multi-function button,
double-press to: reject
call, replay last song,
enter Bluetooth pairing
status,switch language
Multi-function button,
triple-press to: Activate
SIRI Voice Assistant
Charging the headphones
Operating the Charging Case
While charging, the red light will stay on. At full charge, the light
will turn blue, flash for 15 seconds, then enter standby mode.
Low battery alert
The headphone allows you to know when the battery level is low.
Whenever the remaining power is less than 10%, it will emit the
following voice prompt every 20 seconds: "Low battery, please
charge".
Earphone status indicator
Charging Red light stays on
Full charge Blue light stays on
Pairing Red & blue lights flash intermittently
Successful Pairing Red/Blue light flashing stops
Charging case indicator status
Charging process, power display.
Left earphone
power display
Charging case
power display
Right earphone
power display
1. Using the Case to charge your phone:
Connect the phone’s charging cable to USB
Type-A slot on the case. The LED display will
show decreasing power level on the case
(from 100 going down) until the phone is fully
charged and then stop
2. Charging the case: Insert the charging cable
into the USB Type-C slot on the case. The LED
screen will display an incremental change of
power from 0 to 100 during charging.
100 indicates full charge.
Attention
Proper Way of Wearing the Earphones:
While using the earphones, for maximum comfort, please
place them on and in your ears as shown above.
Specifications of earphones
Specifications of earphones
Dimensions: 53 * 43 * 29mm
Weight: 9.0g
Battery capacity: 50mAh
Charging time: 2.5 hours
Operating voltage: 3.3V-4.2V
Standby timeout: 5 minutes (goes into standby if idle for 5mins)
Music playback time: 8 hours
Talk time: 8 hours
Bluetooth version: 5.0
Support: Tensilica HiFi EP, Hardware FFT, SRC, Filter MCSync TWS+
Transmitter RF power: Class 3
Transmission range (Hz): 2.402-2.480GHz
Communication distance: 10M
Audio sampling accuracy: 16 bits
Audio sampling rate: up to 96 KHz
Audio encoding format: CVSD, mSBC, SBC, ACC
Signal to noise ratio:> 95db
Operating temperature: -15℃to 60℃
Operating humidity: 10% to 85% (non-frozen state)
Specifications of earphone speakers
Dimensions: Φ11mm
Resistance: 16Ω + 15% copper ring moving coil SPK
Frequency: 20Hz-20KHz
Sensitivity: 93 ± 3dB
Input power: conventional 2mW, maximum 5mW
Specifications of earphone microphones
Type: Silicon Microphone
Sensitivity: -42 ± 1dB
SPL: 130dB
Safety Instructions
To avoid hearing damage, keep the volume at a moderate level and
avoid listening to music at high volumes for long periods of time, which
may cause permanent damage to your hearing ability, including deafness.
Avoid usingthe earphones while driving, cycling, crossing the road,or
performing/participating in any activity that requires your full attention.
Note: If you use the earphones while watching any video, audio
and video may be slightly out of sync.
After charging is complete, please unplug the charging cable from the
charging case to avoid leaving the product in a charging state for a long
time.
The output voltage and current of the charger are preferably 5V, 1.0A
to 1.5A. If the charger's output voltage or current exceeds the specified
range, it will cause serious damage to the product itself, and the product
warranty will maybecome invalid in that case.
Usage Guide and Precautions
1. Bluetooth products can be affected by the usage environment,
please do not use it in environments with large electromagnetic
fields / high radiation levels; the Bluetooth signal will be
interfered with, and other phenomena may occur
2. When the power of the earphone is less than 10%, it will
result in insufficient audio output. It is recommended to use the
headset with sufficient charge.
3. In case of obstacles or multiple 2.4GHz signals in the same
frequency band, the Bluetooth signal will be interfered with,
and the phenomenasuch as stuttering may occur.
4. Do not put the Bluetooth earphones in water or apply
excessive force on it;those may cause damage to the
earphones, resulting in degraded sound quality.
5. If ear-set is not used for extended periods of time, it is
recommended to charge it once every 30 days to prevent it
from failing to startup when needed, due to lack of power.
6. We may upgrade or modify the software or hardware and
appearance of this product without prior notice to you, no matter
which product you received.
ANC category: ANC analog noise reduction
ANC frequency: 20-22KHz
ANC gain: 25dB
long press:For 2 seconds
to ANC on/off