1. Product Overview
The Intenso O400HA Hybrid Over-Ear Headphones are designed to provide an immersive audio experience with advanced features such as Hybrid Active Noise Cancellation (ANC) and Transparency Mode. Equipped with Bluetooth 5.3, these headphones offer stable wireless connectivity and an impressive battery life of up to 75 hours, making them ideal for extended listening sessions. The ergonomic design ensures comfort for prolonged use, and the foldable structure enhances portability.

Figure 1: Intenso O400HA Hybrid Over-Ear Headphones, showcasing the sleek blue design.
2. Safety Information
- Do not expose the headphones to extreme temperatures, humidity, or liquids.
- Avoid dropping or subjecting the headphones to strong impacts.
- Do not attempt to disassemble or modify the headphones. This will void the warranty.
- Clean the headphones with a soft, dry cloth. Do not use abrasive cleaners.
- Prolonged listening at high volume levels may cause hearing damage.
- Keep out of reach of children.
3. Package Contents
Please check the package for the following items:
- Intenso O400HA Over-Ear Headphones
- USB-C to USB-C Charging Cable
- 1.5m Audio Cable (3.5mm Jack)
- User Manual
4. Setup
4.1 Charging the Headphones
Before first use, fully charge the headphones. Connect the supplied USB-C cable to the charging port on the headphones and the other end to a compatible USB power source (e.g., computer USB port, wall adapter). The LED indicator will show charging status.
- Full Charge Time: Approximately 2 hours.
- Quick Charge: 15 minutes of charging provides approximately 6 hours of playback.
- Battery Life: Up to 75 hours on a full charge (actual battery life may vary based on usage and volume).

Figure 2: Charging and battery life features of the Intenso O400HA headphones.
4.2 Powering On/Off
- Power On: Press and hold the Power button for approximately 3 seconds until the LED indicator lights up.
- Power Off: Press and hold the Power button for approximately 3 seconds until the LED indicator turns off.
4.3 Bluetooth Pairing
- Ensure the headphones are powered off.
- Press and hold the Power button for 5-7 seconds until the LED indicator flashes blue and red alternately, indicating pairing mode.
- On your device (smartphone, tablet, computer), enable Bluetooth and search for available devices.
- Select "Intenso O400HA" from the list of found devices.
- Once connected, the LED indicator will turn solid blue or flash blue slowly.
The headphones support Bluetooth 5.3 for a stable connection up to 15 meters.
5. Operating the Headphones
5.1 Controls Overview
The headphones feature intuitive controls located on the earcups for easy management of audio playback, calls, and noise cancellation modes.
- Power Button: Power on/off, pairing mode.
- Volume Up/Next Track: Short press for volume up, long press for next track.
- Volume Down/Previous Track: Short press for volume down, long press for previous track.
- Multi-function Button (Play/Pause/Call): Single press to play/pause music, answer/end calls. Double press for voice assistant.
- ANC/Transparency Mode Button: Cycle through ANC On, Transparency Mode, and ANC Off.
5.2 Active Noise Cancellation (ANC)
The Hybrid Active Noise Cancellation feature effectively reduces ambient noise, allowing for a more focused listening experience. This technology filters out up to 95% of environmental noise.
- Press the ANC button to activate ANC.
- Press the ANC button again to cycle to Transparency Mode or turn ANC off.

Figure 3: Hybrid Active Noise Cancelling technology utilizing external and internal microphones.

Figure 4: Key features including Hybrid ANC, Environmental Noise Cancellation (ENC), and Transparency Mode.
5.3 Transparency Mode
Transparency Mode allows you to hear your surroundings without removing the headphones, ideal for conversations or being aware of your environment.
- Press the ANC button to cycle to Transparency Mode.
5.4 Music Mode
The headphones offer a balanced sound profile in Music Mode for a comprehensive audio experience.
5.5 Wired Mode (3.5mm Audio Cable)
For situations where Bluetooth is not available or preferred, you can use the included 3.5mm audio cable to connect the headphones to your device. This allows for passive listening even if the battery is depleted.

Figure 5: Headphones connected via the 3.5mm audio cable for wired listening.
5.6 Multi-Device Connection
The Intenso O400HA headphones can be connected to two Bluetooth devices simultaneously, allowing for seamless switching between audio sources.
6. Maintenance
- Cleaning: Use a soft, lint-free cloth to wipe the earcups and headband. For stubborn dirt, slightly dampen the cloth with water. Do not use harsh chemicals or solvents.
- Storage: When not in use, store the headphones in a cool, dry place, away from direct sunlight and extreme temperatures. The foldable design allows for compact storage.
- Battery Care: To prolong battery life, avoid fully discharging the headphones frequently. Charge them regularly, even if not in constant use.

Figure 6: The foldable design of the headphones for easy storage and portability.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Headphones do not power on. | Low battery. | Charge the headphones fully. |
| Cannot pair with device. | Headphones not in pairing mode; Bluetooth off on device; device too far. | Ensure headphones are in pairing mode (flashing blue/red LED). Turn on Bluetooth on your device. Move headphones closer to the device (within 15m). |
| No sound. | Volume too low; incorrect audio source; headphones not connected. | Increase volume on headphones and device. Check if headphones are properly connected via Bluetooth or 3.5mm cable. Ensure correct audio output is selected on your device. |
| ANC not working effectively. | ANC not activated; improper fit. | Press the ANC button to activate. Adjust headphones for a snug fit to ensure proper seal around ears. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Name | Over-Ear O400HA |
| Connectivity Technology | Wireless (Bluetooth 5.3) |
| Wireless Communication Technology | Bluetooth |
| Noise Control | Hybrid Active Noise Cancellation (ANC) |
| Impedance | 32 ohms |
| Headphone Jack | 3.5 mm Jack |
| Form Factor | Circum-Aural (Over-Ear) |
| Battery Composition | Lithium Polymer |
| Rechargeable Battery | Yes |
| Charging Time | 2 hours |
| Battery Life | Up to 75 hours |
| Wireless Range | Up to 15 meters |
| Frequency Response | 20 Hz - 20 kHz |
| Color | Blue |
| Included Components | Cable, Earpad, User Manual |
9. Warranty and Support
Intenso products are manufactured to high quality standards. For information regarding warranty coverage, technical support, or service, please refer to the warranty card included in your package or visit the official Intenso website. Please retain your proof of purchase for warranty claims.





