1. Product Overview
The CXK Open Ear Headphones CT13 are designed for comfort and performance, featuring an open-ear design that allows awareness of surroundings while enjoying audio. These lightweight earbuds utilize Bluetooth 5.4 for stable connectivity and offer extended battery life, making them suitable for various activities including sports and daily use.

Image: CXK Open Ear Headphones CT13 and their charging case. The earbuds feature an ergonomic hook design, and the case has a digital power display.
2. What's in the Box
Verify that all components are present upon unboxing:
- CXK CT13 Open Ear Headphones (1 pair)
- Charging Case (1)
- USB-C Charging Cable (1)
- User Manual (1)

Image: An illustration showing the CXK CT13 earbuds, charging case, USB-C cable, and user manual, representing the contents included in the product packaging.
3. Setup
3.1 Charging the Headphones and Case
Before first use, fully charge the headphones and the charging case. Place the earbuds into the charging case. Connect the USB-C cable to the charging case and a power source. The LED display on the charging case will indicate the battery level. A full charge takes approximately 1.5 hours.

Image: The CXK CT13 earbuds are shown inside their charging case, which displays a digital battery percentage, indicating the charging status and remaining power.
3.2 Bluetooth Pairing
- Ensure the headphones are charged.
- Open the charging case. The earbuds will automatically enter pairing mode.
- On your device (smartphone, tablet, computer), enable Bluetooth.
- Search for available Bluetooth devices and select "CXK CT13" from the list.
- Once connected, a voice prompt will confirm successful pairing. The headphones will automatically reconnect to the last paired device when taken out of the case.

Image: An illustration of a Bluetooth 5.4 chip, symbolizing the seamless and stable wireless connection technology used in the headphones, offering an ultra-long connection range of 33 feet.
3.3 Wearing the Headphones
The CXK CT13 headphones feature an open-ear design with flexible ear hooks for a secure and comfortable fit.
- Hang the end of the earbud on the ear helix.
- Rotate it backward along the auricle.
- Adjust the ear hook until the headset is worn stably and comfortably.

Image: A three-step diagram illustrating the ergonomic design and proper method for wearing the CXK Open Ear Headphones, ensuring a secure and comfortable fit around the ear.
4. Operating Instructions
The CXK CT13 headphones feature intuitive physical buttons for control.

Image: A visual guide detailing the intuitive button controls on the CXK CT13 earbuds, showing icons for answering calls, skipping tracks, and volume control.
| Action | Function |
|---|---|
| Click either earbud button once | Answer/End a call, Play/Pause music |
| Double click L/R earbud button | Previous/Next Song |
| Long press R/L earbud button | Volume +/- |
| Triple click either earbud button | Activate Voice Assistant |
| Long press either earbud button for 2 seconds | Reject call |
5. Maintenance
5.1 Cleaning
Regularly clean the earbuds and charging case with a soft, dry, lint-free cloth. Avoid using abrasive materials or harsh chemicals. Do not submerge the charging case in water.
5.2 Water Resistance
The CXK CT13 headphones are IPX6 water-resistant, meaning they can withstand powerful water jets. This makes them suitable for use during workouts and in light rain. However, they are not designed for swimming or submersion in water. Ensure the earbuds are dry before placing them back into the charging case to prevent damage.

Image: The CXK CT13 earbuds are shown with water droplets on their surface, illustrating their IPX6 water-resistant capability, allowing continued use during sweaty workouts without interruption.
5.3 Storage
When not in use, store the headphones in their charging case to protect them from dust, dirt, and physical damage. Store in a cool, dry place away from extreme temperatures.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Headphones not turning on | Low battery | Place earbuds in charging case and charge fully. |
| Cannot pair with device | Bluetooth not enabled, out of range, or already paired to another device | Ensure Bluetooth is on, move closer to device, disconnect from other devices, or try re-pairing. |
| No sound or low volume | Volume too low on device/headphones, or not properly connected | Adjust volume on both device and headphones. Reconnect Bluetooth. |
| Sound cutting in/out | Interference, too far from device, or low battery | Move closer to device, avoid strong electromagnetic fields, charge headphones. |
| Microphone not working | Microphone blocked, or device settings | Ensure microphone is clear. Check device's audio input settings. |
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | CT13 |
| Connectivity Technology | Wireless (Bluetooth) |
| Bluetooth Version | 5.4 |
| Bluetooth Range | Up to 33 Feet (10 meters) |
| Audio Driver Type | Bone Conduction Driver |
| Audio Driver Size | 13 Millimeters |
| Frequency Response | 20 Hz |
| Sensitivity | 98 dB |
| Impedance | 32 Ohm |
| Earpiece Shape | Open Ear |
| Single Charge Playtime | Up to 12 hours |
| Total Playtime (with Charging Case) | Up to 60 hours |
| Charging Time | Approx. 1.5 hours |
| Water Resistance Level | IPX6 |
| Item Weight (each earbud) | 0.27 ounces (approx.) |
| Control Type | Physical Buttons (Touch, Voice) |
| Material | Plastic, Silicone (Ear hooks) |
8. Warranty and Support
For warranty information and customer support, please refer to the contact details provided on the product packaging or the official CXK website. Keep your purchase receipt as proof of purchase for any warranty claims.