1. Product Overview
The Acer Ohr644 In-Ear Wireless Bluetooth Headphones are designed to provide a superior audio experience with advanced features such as Active Noise Cancellation (ANC), panoramic spatial sound, and extended battery life. These lightweight and comfortable earbuds are ideal for various activities, including sports, running, gaming, and daily use with mobile phones and tablets.
Key features include:
- Active Noise Cancellation (ANC) for an undisturbed listening experience.
- Panoramic Spatial Sound for an immersive audio environment.
- Wireless 5.4 Flash Connect Chip for anti-interference and ultra-stable connection.
- Ergonomic design for gentle and comfortable wearing, reducing ear burden.
- Environmental Noise Cancellation (ENC) for clear call quality.
- Long-lasting battery life with quick charging.
- Smart Dynamic Audio for delicate vocal texture and balanced sound.
2. Package Contents
Please check the package for the following items:
- Acer Ohr644 In-Ear Wireless Bluetooth Headphones (Left and Right earbuds)
- Charging Case
- USB Type-C Adapter (Charging Cable)
- User Manual (This document)
3. Specifications
| Feature | Specification |
|---|---|
| Brand Name | Acer |
| Model | Ohr644 |
| Material | Plastic |
| Style | TWS In-Ear Headphones |
| Wireless Type | Bluetooth 5.4 |
| Communication | Wireless |
| Connectors | Type-C |
| Earphone Battery Capacity | 40mAh (per earbud) |
| Charging Case Battery Capacity | 350mAh |
| Music Playback Time | 5-6 hours |
| Charging Time | Approx. 1.5 hours |
| Weight of Earphones | 4.0g (0.14oz) * 2 |
| Maximum Wireless Range | <10m (accessible condition: ≥10m/393.7in) |
| Frequency Response Range | 20Hz-20KHz |
| Vocal Unit (Driver Size) | Φ10mm/0.394inch |
| Impedance Range | Up to 32 Ω |
| Active Noise-Cancellation (ANC) | Yes (Deep ANC, -56dB deepest, -37dB average reduction) |
| Environmental Noise Cancellation (ENC) | Yes (for calls) |
| With Microphone | Yes |
| Volume Control | Yes |
| Control Button | Yes (Touch Control) |
| Waterproof | No |
| Support APP | No |
| Certification | CE, FCC, RoHS |
4. Setup & Pairing
Your Acer Ohr644 headphones are designed for quick and seamless connection.
4.1 Initial Pairing
- Ensure your headphones are charged (refer to Section 6 for charging instructions).
- Open the charging case. The earbuds will automatically enter pairing mode.
- On your mobile phone or tablet, enable Bluetooth and search for available devices.
- Select "Acer Ohr644" from the list of devices to connect.
- Once connected, you will hear an audio prompt, and the indicator lights on the earbuds will change (specific light behavior not detailed, assume solid or off).
The headphones utilize a Wireless 5.4 Flash Connect Chip for anti-interference and an ultra-stable connection, ensuring continuous audio without stuttering.
4.2 Reconnection
After the initial pairing, the headphones will automatically connect to the last paired device when removed from the charging case and Bluetooth is enabled on the device.
5. Controls & Functions
The Acer Ohr644 headphones feature intuitive touch controls on both earbuds. The touch area is typically located on the outer surface of the earbud stem.
5.1 Music Mode Controls
- Pause/Play: Single tap on either the Left (L) or Right (R) earbud.
- Next/Previous Track: Double tap on either the Left (L) or Right (R) earbud.
- Activate Voice Assistant: Triple tap on either the Left (L) or Right (R) earbud.
5.2 Call Mode Controls
- Answer Call: Double tap on either the Left (L) or Right (R) earbud.
- Hang Up Call: Double tap on either the Left (L) or Right (R) earbud during a call.
- Reject Call: Long press (hold for 2 seconds) on either the Left (L) or Right (R) earbud.
5.3 Active Noise Cancellation (ANC) Function Conversion
- Toggle ANC/Transparency Mode: Long press the function key (touch area) on either earbud until you hear a 'beep' sound. This will cycle through Transparency Mode, ANC On, and ANC Off.
6. Active Noise Cancellation (ANC)
The Acer Ohr644 headphones feature advanced Active Noise Cancellation technology to provide an immersive and undisturbed listening experience.
6.1 How ANC Works
The intelligent noise reduction algorithm responds in milliseconds to environmental noise changes, effectively isolating up to 99% of environmental noise. This deep ANC noise reduction targets various types of noise, including:
- Low frequency wind noise
- Vocal noise
- Vehicle honking
- Subway noise
6.2 Enhanced Call Clarity (ENC)
In addition to ANC for listening, the headphones incorporate Environmental Noise Cancellation (ENC) to filter out environmental noise during calls, ensuring your voice is heard clearly.
6.3 Noise Reduction Technology Breakdown
The ANC system is comprised of:
- Digital Signal Processor: Shields noise and optimizes sound waves.
- Adaptive Active Noise Reduction: More delicate sound source to isolate noise.
- HD Noise Reduction Chip: Provides faster noise processing.
- Sound Absorbing Soft Adhesive: Ensures a perfect fit in the ear canal for optimal noise isolation.
The noise reduction frequency range is 20-20kHz, with a deepest noise reduction depth of -56dB and an average reduction of -37dB.
6.4 Optimized ANC Scenarios
The intelligent noise reduction algorithm is optimized for various daily scenarios:
- Airplane: Automatic deep noise reduction and hearing protection against excessive aircraft noise.
- Fitness: Significant increase in noise reduction depth, effectively weakening severe low-frequency noise.
- Office: Exclusive optimization solution for keyboard sound, air conditioning sound, and human voice.
7. Charging
To ensure continuous use, keep your Acer Ohr644 headphones and charging case adequately charged.
7.1 Charging the Earbuds
Place the earbuds into the charging case. They will automatically begin charging. The earbuds have a 40mAh battery capacity each, providing 5-6 hours of music playback on a single charge.
7.2 Charging the Case
Connect the provided USB Type-C cable to the charging port on the case and to a power source. The charging case has a 350mAh battery capacity. A full charge for both the earbuds and case takes approximately 1.5 hours.
8. Wearing & Comfort
The Acer Ohr644 headphones are designed for gentle and comfortable wear, minimizing burden on your ears even during extended use.
- Lightweight Design: Each earbud weighs only 4g (0.14oz).
- ErgoFit Ergonomics: Based on human ear data models, the design ensures a comfortable fit for various ear sizes.
- Biomimetic Ear Curve: The ergonomic design conforms naturally to the ear.
- Silicone Ear Tips: Provide a comfortable fit and contribute to noise reduction.
9. Troubleshooting
If you encounter any issues with your Acer Ohr644 headphones, please refer to the following common troubleshooting steps:
- No Sound/Connection Issues:
- Ensure both earbuds are charged.
- Make sure Bluetooth is enabled on your device.
- Turn off and on your device's Bluetooth.
- Place earbuds back in the case, close it, wait a few seconds, then open it again to re-initiate pairing.
- Forget "Acer Ohr644" from your device's Bluetooth settings and re-pair.
- One Earbud Not Working:
- Ensure both earbuds are charged.
- Place both earbuds back in the charging case, close the lid, and then open it again. This often re-syncs them.
- Try resetting the earbuds (if a reset procedure is available, it's usually a long press on both earbuds while in the case, or a button on the case itself - specific reset not detailed in provided data).
- ANC Not Functioning:
- Ensure ANC is activated via the touch controls (long press to cycle modes).
- Check that the earbuds are properly seated in your ears to create a good seal.
- Poor Call Quality:
- Ensure the microphone is not obstructed.
- Check your network connection if using a mobile phone.
- Ensure ENC is active (it typically works automatically during calls).
If the issue persists, please contact Acer customer support for further assistance.
10. User Tips
No specific user tips were available from provided reviews or Q&A content.
11. Warranty & Support
For warranty information and technical support, please refer to the official Acer website or contact your local Acer service center. Keep your proof of purchase for any warranty claims.
