1. Product Overview
The Callez Bluetooth Single Ear Headset (Model C01) is designed for clear, hands-free communication and high-quality audio playback. It features advanced noise cancellation technology, comfortable ear-hook design, and multi-device connectivity, making it ideal for various uses including online meetings, driving, and daily tasks.

The Callez Bluetooth single ear headset, shown with its compact charging case. The headset features an ear-hook design and an extended microphone boom.
2. Package Contents
Please check the package for the following items:
- Callez C01 Wireless Headset
- USB Charging Cable (Type-C)
- Protective Case
- User Guide
- Ear Tips (L, M, S sizes)
- Sponge Ear Cushions (2 pieces)

An image displaying the complete package contents: the Callez C01 wireless headset, a USB charging cable, a protective case, a user guide, and various sizes of ear tips and sponge ear cushions.
3. Product Diagram and Controls
Familiarize yourself with the headset's components and control buttons:

Detailed diagram showing the multi-function button (MFB) for power, call control, music playback, and redial. Also highlights volume controls, mute button, voice assistant activation, and the Type-C charging port with dust cover.
- Multi-Function Button (MFB): Power On/Off, Answer/End/Reject Call, Play/Pause Music, Redial.
- Volume + Button: Increase volume, Next track.
- Volume - Button: Decrease volume, Previous track.
- Mute Button: Mute/unmute microphone during calls, Activate Voice Assistant.
- Type-C Charging Port: For charging the headset, with a dust cover.
- LED Indicator: Shows pairing status, charging status, and power.
4. Setup
4.1 Charging the Headset
Before first use, fully charge the headset. Connect the provided USB Type-C cable to the headset's charging port and the other end to a USB power source (e.g., computer, wall adapter). The LED indicator will show charging status and turn off when fully charged.
- Charging Time: Approximately 1.5 hours for a full charge.
- Talk Time: Up to 16 hours.
- Music Playback Time: Up to 20 hours.
- Standby Time: Up to 195 hours.

An infographic detailing the impressive battery life: 16 hours talk time, 20 hours music playback, and 195 hours standby time, with a fast charge time of 1.5 hours.
4.2 Pairing with a Bluetooth Device
Follow these steps to pair your headset with your smartphone, tablet, or computer:
- Enter Pairing Mode: With the headset powered off, press and hold the Multi-Function Button (MFB) for approximately 5-7 seconds until the LED indicator flashes blue and red alternately. This indicates the headset is in pairing mode.
- Enable Bluetooth on Your Device: Go to the Bluetooth settings on your smartphone, tablet, or computer and ensure Bluetooth is turned on.
- Search and Connect: In the list of available Bluetooth devices, search for and select "C01".
- Connection Confirmation: Once connected, the LED indicator on the headset will stop flashing and remain solid blue (or turn off, depending on the model). A voice prompt may also confirm the connection.

A visual guide to pairing the headset: 1. Press and hold the multi-function button until the LED indicator flashes blue and red alternately (pairing mode). 2. Search for 'C01' on your phone's Bluetooth list and select it. 3. The LED indicator stops flashing, indicating successful connection.
Note: The headset supports simultaneous connection with two Bluetooth devices. To connect a second device, repeat the pairing process after the first device is connected. The headset will automatically connect to the last paired device when powered on, if it is within range.

This image demonstrates the headset's ability to connect to various Bluetooth devices, including iOS, Android, and Windows devices. It highlights the ease of pairing with two Bluetooth devices simultaneously.
5. Operating Instructions
5.1 Power On/Off
- Power On: Press and hold the MFB for 3 seconds.
- Power Off: Press and hold the MFB for 5 seconds.
5.2 Call Management
- Answer Call: Short press the MFB.
- End Call: Short press the MFB during a call.
- Reject Call: Press and hold the MFB for 2 seconds during an incoming call.
- Redial Last Number: Double-press the MFB.
- Mute/Unmute Microphone: Short press the Mute button during a call.

A woman is shown using the Callez headset, emphasizing the microphone mute function during calls and compatibility with voice assistants like Siri and Android. This feature allows for hands-free communication, freeing up both hands for other tasks.
5.3 Music Playback
- Play/Pause: Short press the MFB.
- Next Track: Long press the Volume + button.
- Previous Track: Long press the Volume - button.
5.4 Volume Control
- Increase Volume: Short press the Volume + button.
- Decrease Volume: Short press the Volume - button.
5.5 Voice Assistant (Siri/Android)
Activate your device's voice assistant by short pressing the Mute button when not on a call. This allows for voice commands and hands-free operation.
5.6 Wearing the Headset
The headset is designed for comfortable wear on both the left and right ears. The ear hook can rotate 180 degrees, and the microphone boom can rotate 270 degrees to adjust for optimal positioning.

This image illustrates the headset's versatility, showing it can be comfortably worn on either the left or right ear. It also highlights the included L, M, S ear tips and the 270° microphone rotation and 180° ear hook rotation for optimal fit and positioning.
For an unstable fit, two sponge ear cushions are included. These can be attached to the outside of the L/M/S ear tips to improve stability and comfort.
6. Maintenance
To ensure the longevity and optimal performance of your Callez headset, follow these maintenance guidelines:
- Cleaning: Wipe the headset with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the headset in its protective case when not in use to prevent damage from dust, moisture, and impacts.
- Temperature: Avoid exposing the headset to extreme temperatures (hot or cold) or direct sunlight for extended periods.
- Moisture: Keep the headset dry. Do not immerse it in water or expose it to excessive humidity. The charging port has a dust cover for protection.
- Battery Care: For long-term storage, charge the headset at least once every three months to maintain battery health.
7. Troubleshooting
If you encounter issues with your headset, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Cannot find headset on phone's Bluetooth list | Headset not in pairing mode; Bluetooth error on phone. | Ensure MFB is pressed until LED flashes blue/red. Reset headset (press Volume - and Mute simultaneously until red/blue LED flashes twice, then powers off). Delete existing pairing data on phone and restart phone. |
| No sound from headset | Headset not properly connected; out of range; connected to another device. | Verify headset is correctly connected to your phone. Ensure headset and phone are within 10m. Check if phone is connected to another Bluetooth device. |
| Call quality issues (e.g., dropped calls) | Interference from Wi-Fi; high-quality sound effect settings. | Bluetooth is wireless communication, recording is not recommended. If high-quality sound effects are selected in phone settings, calls may be interrupted due to Wi-Fi interference. This is not a product defect. |
| Microphone mute not working on computer | Mute function not supported on computer devices. | The microphone mute function is not supported when connected to computer devices. |
| Volume adjustment issues | Volume synchronization differences between devices. | For iOS: Headset and iOS device volumes are synchronized. Adjust from either. For Android: Headset and Android device volumes are not synchronized. You can increase Android volume even if headset volume is max. |

A man wearing the Callez headset in an office setting, demonstrating the effectiveness of the dual microphone ENC and CVC8.0 noise cancellation technology for clear communication.
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | C01 |
| Noise Control | Hybrid Noise Cancelling (ENC + CVC8.0 Dual Mic) |
| Connectivity Technology | Wireless (Bluetooth) |
| Wireless Communication Technology | Bluetooth |
| Audio Codec Support | aptX HD, SBC |
| Included Components | Cable, Protective Case, Instruction Manual |
| Target Age | Adult |
| Product Weight | 100 grams |
| Battery Type | Lithium Polymer (1 included) |
| Color | Black |
| Ear Placement | In-Ear (Ear-hook style) |
| Impedance | 32 Ohm |
9. Warranty and Support
Callez is committed to providing excellent after-sales service. Your product comes with the following assurances:
- 45-Day Refund Period: If you are not satisfied with the product, you may be eligible for a refund within 45 days of purchase.
- 24-Month Quality Warranty: The product is covered by a 24-month warranty against manufacturing defects.
If you encounter any issues with the product, please contact our after-sales service team before initiating a return or leaving a review. We are dedicated to resolving any problems you may experience.
For support, please visit the Callez store on Amazon or contact us through the Amazon messaging system.



