Introduction
The ACEFAST ACEFIT Pro are innovative open-ear earphones designed for comfort, safety, and high-quality audio. Featuring a unique LED ambient breathing light, Bluetooth 5.4 connectivity, and advanced noise-cancelling technology, these earphones are perfect for various activities, from sports to daily commutes. Their lightweight, ear-hook design ensures a secure and comfortable fit without blocking ambient sounds, enhancing situational awareness.

Figure 1: ACEFAST ACEFIT Pro Earphones and Charging Case
Key Features:
- iF Design Award Winner: Recognized globally for its innovative LED illumination and open-ear design.
- LED Ambient Breathing Light: 40 integrated lights create a unique glowing matrix, enhancing visibility and personal style, especially at night.
- Superior Sound Quality: Features an industry-first 0.5mm high-amplitude, 1.4g ultra-small speaker and dual processor for deep bass, clear mid-high frequencies, and immersive 3D sound.
- Ergonomic Open-Ear Design: Lightweight (7.5g per ear) and made with soft liquid silicone for a comfortable, stress-free fit that allows ambient sounds to be heard.
- ENC Noise-Cancelling Calls: Ensures clear voice calls by effectively cutting out external noise, ideal for telework and online meetings.
- Bluetooth 5.4 & Multi-point Connectivity: Provides stable, power-efficient connection and allows simultaneous pairing with two devices (e.g., smartphone and PC).
- Long Battery Life & Fast Charging: Up to 36 hours of continuous use with the charging case, with rapid charging capability.
- Customizable Experience: Dedicated ACEFAST APP allows personalization of light color, rhythm, sound modes, and touch controls.
Setup
1. Charging the Earphones and Case
Before first use, fully charge the earphones and the charging case. Place the earphones into the charging case. Connect the provided Type-C charging cable to the charging case and a power source. The LED display on the case will indicate the charging status.

Figure 2: Charging and Battery Display
- Earphone Battery Life: Up to 8 hours on a single charge.
- Total Playback with Case: Up to 30 hours.
- Rapid Charging: 5 minutes of charging provides up to 2 hours of playback.
2. Pairing with Your Device
- Open the charging case. The earphones will automatically enter pairing mode.
- On your device (smartphone, tablet, PC), go to Bluetooth settings and turn on Bluetooth.
- Search for available devices and select "ACEFIT Pro" from the list.
- Once connected, you will hear a confirmation tone, and the earphones will be ready for use.

Figure 3: Multi-point Connectivity
3. Wearing the Earphones
The ACEFIT Pro features an ear-hook design for a secure and comfortable fit. Gently place the ear-hook over your ear, ensuring the speaker grille is positioned directly above your ear canal for optimal sound quality. The flexible titanium wire allows for slight adjustments to fit various ear shapes.

Figure 4: Flexible Ear-Hook Design for Optimal Fit
Operating Instructions
Touch Controls
The ACEFIT Pro earphones feature intuitive touch controls on each earbud. Refer to the table below for common functions:
| Action | Function |
|---|---|
| Single Tap | Play/Pause Music, Answer/End Call |
| Double Tap (Left Earbud) | Previous Track |
| Double Tap (Right Earbud) | Next Track |
| Triple Tap (Left Earbud) | Volume Down |
| Triple Tap (Right Earbud) | Volume Up |
| Long Press (2 seconds) | Reject Call, Activate Voice Assistant (Siri, Google Assistant) |
| Quadruple Tap (Either Earbud) | Turn LED light ON/OFF |
ACEFAST APP Customization
Download the dedicated "ACEFAST APP" from the Android Store or App Store to unlock full customization options for your earphones.

Figure 5: ACEFAST App Interface
- Sound Modes: Switch between various sound modes (e.g., Original, Vocal Enhancement, Live, Custom EQ, Bass Boost) to suit your preference.
- LED Light Customization: Change the color and rhythm of the LED ambient breathing light.
- EQ Settings: Adjust equalizer settings for personalized audio.
- Touch Control Settings: Customize touch functions.
- Battery Level Check: Monitor the battery status of your earphones and case.

Figure 6: LED Light Control via App and Touch
Maintenance
To ensure the longevity and optimal performance of your ACEFAST ACEFIT Pro earphones, follow these maintenance guidelines:
- Cleaning: Regularly wipe the earphones and charging case with a soft, dry, lint-free cloth. Do not use abrasive cleaners, alcohol, or chemical solvents.
- Storage: When not in use, store the earphones in their charging case to protect them from dust and damage. Store in a cool, dry place away from direct sunlight and extreme temperatures.
- Water Resistance: The earphones are waterproof (IPX rating not specified, but generally means splash-proof). Avoid submerging them in water or exposing them to heavy rain. Dry them thoroughly if they get wet.
- Charging Port: Keep the Type-C charging port clean and free of debris.
- Avoid Impact: Do not drop or subject the earphones to strong impacts, as this can damage internal components.
Troubleshooting
If you encounter issues with your ACEFAST ACEFIT Pro earphones, try the following solutions:
| Problem | Possible Solution |
|---|---|
| Earphones do not turn on. | Ensure the earphones are charged. Place them in the charging case and check the battery indicator. |
| Cannot pair with device. | Make sure Bluetooth is enabled on your device. Ensure earphones are in pairing mode (open case). Try forgetting the device in your Bluetooth settings and re-pairing. Move closer to your device. |
| No sound or low volume. | Check the volume level on both the earphones and your connected device. Ensure the earphones are properly seated in your ears. Try adjusting the position of the speaker grille above your ear canal. |
| Sound cuts out or is unstable. | Move closer to your connected device. Avoid environments with strong Wi-Fi or other wireless interference. Ensure no physical obstructions between earphones and device. |
| Microphone not working during calls. | Ensure the earphones are selected as the audio input device on your phone/PC. Check for any mute functions activated on your device or the earphones. |
| LED lights not working. | Check the ACEFAST APP for light settings. Try quadrupling tapping either earbud to toggle the lights. Ensure earphones are charged. |
| Earphones uncomfortable or don't fit well. | Gently adjust the flexible ear-hook to conform to your ear shape. Ensure the speaker grille is aligned with your ear canal. |
If the problem persists after trying these steps, please contact ACEFAST customer support for further assistance.
Specifications
| Feature | Specification |
|---|---|
| Model Name | ACEFIT Pro FA001 |
| Connectivity Technology | Bluetooth 5.4, ACEFAST EDR Enhanced Connection Technology |
| Noise Control | Noise Isolation (ENC for calls) |
| Frequency Response | 2000 KHz |
| Sensitivity | 90 dB |
| Impedance | 8 Ohm |
| Ear Placement | Over-Ear (Ear-hook) |
| Product Weight | 54.8 grams (Total), 7.5g per earbud |
| Continuous Use Time | 36 Hours (with charging case) |
| Charging Time | 2 Hours |
| Water Resistance Level | Waterproof (Splash-proof) |
| Material | Silicone, ABS, PC, Nickel-Titanium Shape Memory Wire |
| Included Components | Instruction Manual, Type-C Cable, Earphone Unit, Wireless Charging Case |
Warranty and Support
ACEFAST products are designed and manufactured to the highest quality standards. For warranty information and customer support, please refer to the official ACEFAST website or the contact details provided in your product packaging.
For technical assistance, troubleshooting not covered in this manual, or warranty claims, please contact ACEFAST customer service directly. Keep your purchase receipt as proof of purchase for warranty purposes.





