Shenzhen Bonfin Technology F4 Noise-Cancelling Headphones User Manual

Shenzhen Bonfin Technology F4 Noise-Cancelling Headphones

Initial Usage

1. Opening the charging case will automatically turn on the earphones. The earphones will quickly emit 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.

Subsequent 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 earphones by simply opening the charging case. The earphones will automatically reconnect to your phone even before you take it out of the case.

Note: After opening the case, if the earphones are not taken out, they will turn off 5 minutes later.

Operating the Charging Case

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.

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. While many of the earphones (L / R) is charging, the red light will stay 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 a full charge.

Note: When the earphone is being 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/pause music, answer calls, hang up, etc.
• Side buttons, short press: “+” to increase volume “-” to reduce volume.
• Side buttons, double-press: “+” to skip to the next song “-” to skip to the previous song.
• Multi-function button, long press:For 3 seconds to turn off for 6 seconds to turn on long press:For 2 seconds to ANC on/off.
• Multi-function button, double-press to reject a call, replay the last song, enter Bluetooth pairing status, and switch language.
• Multi-function button, triple-press to Activate SIRI Voice Assistant.

Charging the headphones
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 case indicator status
Charging process, power display.

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
• 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
• ANC category: ANC analog noise reduction
• ANC frequency: 20-22KHz
• ANC gain: 25dB
• 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 using the 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 become invalid in that case.

Usage Guide and Precautions

1. Bluetooth products can be affected by the usage environment, please do not use them 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 the 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 phenomena such as stuttering may occur.
4. Do not put the Bluetooth earphones in water or apply excessive force on them; those may cause damage to the earphones, resulting in degraded sound quality.
5. If the 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 the appearance of this product without prior notice to you, no matter which product you received.

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