SereniBrain TH21A
SereniBrain Meditation Headband User Manual
Model: TH21A | Brand: SereniBrain
Introduction
The SereniBrain Meditation Headband is an advanced EEG biofeedback device designed to enhance your meditation practice and improve mental clarity. It provides real-time visual and auditory feedback based on your brainwave activity, helping you to achieve deeper states of focus and relaxation. This manual provides comprehensive instructions for the proper setup, operation, maintenance, and troubleshooting of your device.
What's Included
Upon unboxing your SereniBrain Meditation Headband, please ensure all the following components are present:
- 1 x Smart Headband
- 6 x Signals-Collecting Pads
- 1 x USB Charging Cable
- 1 x Storage Carrying Case
- 1 x User Manual (this document)
Setup
1. Charging the Headband
Before initial use, fully charge your SereniBrain Meditation Headband. Connect the provided USB Charging Cable to the headband's charging port and a compatible USB power source. A full charge takes approximately 2 hours and provides up to 8 hours of battery life.
2. Downloading the SereniBrain App
The SereniBrain Meditation Headband operates in conjunction with the dedicated SereniBrain app. Download the app from your device's app store:
- Apple App Store: Search for "SereniBrain"
- Google Play Store: Search for "SereniBrain"
- Samsung Galaxy Store: Search for "SereniBrain"
The app is compatible with iOS 14 or higher and Android 10 or higher. Ensure your smartphone or tablet meets these requirements.
3. Proper Headband Placement
Correct placement of the headband is crucial for accurate brainwave signal collection. Follow these guidelines:
- Adjust the strap for a suitable tightness to ensure a snug fit without discomfort.
- Ensure all three electrodes make firm contact with the skin on your forehead.
- It is recommended to use wet wipes to clean your forehead before wearing the headband to improve sensor contact.



From left to right: Correct headband placement, incorrect placement (too high), and adjusting electrodes for optimal contact.
Operating Instructions
1. Connecting to the App via Bluetooth
Once the headband is charged and worn correctly, open the SereniBrain app on your device. Ensure Bluetooth is enabled on your smartphone or tablet. The app will guide you through the pairing process. A stable connection is indicated within the app interface.
2. Understanding Real-Time Feedback
The SereniBrain headband provides real-time visual and auditory feedback based on your brainwave activity. This feedback helps you understand and influence your meditation state.
- Visual Feedback: Images and scenes within the app become clearer and more vivid as your meditation state improves.
- Auditory Feedback: Sounds within the app, such as gentle waves or birds chirping, will change in intensity or clarity, reflecting your brainwave patterns.

The SereniBrain app provides real-time visual and auditory feedback to guide your meditation.
3. Meditation Practice Methods
The SereniBrain app offers two primary practice methods:
- Free Practice: Customize the duration of your meditation session.
- Guided Practice: Engage in structured sessions, including an 8-week meditation program, each with unique audiovisual biofeedback.
You can also use the "Meditation Tracker" feature to play audio from any third-party app while still monitoring your brainwave activity and generating detailed reports.

Explore various meditation practices within the SereniBrain app.
4. Brainwave Analysis and Reports
After each session, the app generates a detailed report, providing insights into your brain activity and meditation performance. The headband measures various brainwave types:
- Alpha Waves: Associated with a relaxed, yet alert state.
- Beta Waves: Linked to active, busy, or anxious thinking.
- Gamma Waves: Involved in higher-level cognitive functions and learning.
- Theta Waves: Often present during deep relaxation, light sleep, or meditative states.
- Delta Waves: Predominant during deep, dreamless sleep.
- SMR (Sensorimotor Rhythm) Waves: Relates to focus and emotional control.
The reports include meditation scores, performance states (active, relaxed, calm), and personalized improvement tips. You can also share and export your data.

Review detailed reports and brainwave analysis after each meditation session.
Maintenance
Cleaning the Headband
To maintain optimal performance and hygiene, regularly clean the headband, especially the electrode areas. Use a soft, damp cloth or a wet wipe to gently clean the surfaces. Avoid using harsh chemicals or abrasive materials.
Storage
When not in use, store the SereniBrain Meditation Headband in its provided storage carrying case. This protects the device from dust, damage, and ensures its longevity.

The compact carrying case provides convenient storage and portability.
Replacement Signal-Collecting Pads
The signal-collecting pads are designed for durability, but may require replacement over time. For optimal performance, use only official SereniBrain replacement pads. Information on purchasing replacement pads can be found on the SereniBrain official website or authorized retailers.

Official replacement gel pads ensure continued optimal performance.
Troubleshooting
If you encounter issues with your SereniBrain Meditation Headband, please refer to the following common troubleshooting steps:
- No Connection to App:
- Ensure the headband is fully charged.
- Verify Bluetooth is enabled on your device and the headband is within range.
- Restart both the headband (if applicable) and the SereniBrain app.
- Check that the headband is properly worn with all electrodes making good skin contact.
- Inaccurate Brainwave Readings / Signal Drops:
- Re-adjust the headband to ensure snug fit and proper electrode contact.
- Clean your forehead with a wet wipe before wearing to remove oils or dirt that might interfere with signal collection.
- Ensure the signal-collecting pads are clean and not worn out. Replace if necessary.
- Minimize movement during meditation sessions for stable signal processing.
- App Freezing or Crashing:
- Ensure your app is updated to the latest version.
- Close and reopen the app.
- Restart your smartphone or tablet.
- Verify your device meets the minimum operating system requirements (iOS 14+ or Android 10+).
If issues persist after attempting these steps, please contact SereniBrain customer support for further assistance.
Specifications
| Feature | Detail |
|---|---|
| Brand | SereniBrain |
| Model Number | TH21A |
| Material | Plastic |
| Color | Dark Grey |
| Product Dimensions | 7.08"L x 5.9"W x 1.02"H |
| Item Weight | 50 Grams (1.76 ounces) |
| Battery Life | Up to 8 Hours |
| Charging Time | Approx. 2 Hours (Fast Charging) |
| Sensor Type | EEG |
| Battery Type | Lithium-Ion |
| Connectivity | Bluetooth 5.0 |
| Compatible Devices | Smartphones, Tablets (iOS 14 or higher, Android 10 or higher) |
| Manufacturer | iHNNK Inc. |
| Language | English (App content exclusively in English) |
Note: Specifications are subject to change without prior notice.
Warranty and Support
For warranty information, technical support, or any inquiries regarding your SereniBrain Meditation Headband, please contact the manufacturer, iHNNK Inc., or visit the official SereniBrain website. Please retain your proof of purchase for warranty claims.
The SereniBrain app and its built-in content are exclusively in English. Other language versions are not supported.