Introduction
Thank you for choosing the Rulefiss BX27 Bluetooth Sport Headphones. This manual provides detailed instructions on how to set up, operate, and maintain your new headphones. Please read this manual carefully before use to ensure optimal performance and longevity of your device.
Video Description: This video provides a brief overview of the Rulefiss BX27 Bluetooth Sport Headphones, highlighting features such as Bluetooth 5.4 connectivity, 14.2mm dynamic drivers for realistic sound, flexible and soft ear hooks for secure fit, easy button controls, IP7 waterproofing, and up to 75 hours of music playback with the charging case. The video showcases the earbuds and charging case in a sleek black design.
What's in the Box
Please check the package contents upon unboxing:
- Rulefiss BX27 Wireless Earbuds (Left and Right)
- Wireless Charging Case
- USB-C Charging Cable
- User Manual
- Multiple Sizes of Ear Tips (S, M, L)

Image Description: An image displaying the complete contents of the Rulefiss BX27 package. It shows the earbuds, the charging case, a USB-C cable, the user manual, and three pairs of ear tips in small, medium, and large sizes. The pre-installed ear tips on the earbuds are size M.
Product Overview
The Rulefiss BX27 headphones feature an ergonomic design with flexible ear hooks for a secure and comfortable fit, ideal for sports and active use. The charging case includes a dual LED display to show battery levels for both the case and individual earbuds.

Image Description: The Rulefiss BX27 earbuds are shown inside their open charging case. The case features a digital LED display indicating the battery percentage of the charging case (100%) and individual battery levels for each earbud.

Image Description: A close-up view of a single black Rulefiss BX27 wireless earbud, emphasizing its ultra-lightweight design (4g) and flexible ear hook. The image suggests a feather-light feel for extended comfort.
Setup
1. Charging the Headphones
Before first use, fully charge the headphones and the charging case. Connect the provided USB-C cable to the charging port on the case and a power source. The LED display on the case will show the charging progress. A full charge takes approximately 1.5 hours.
- Earbud Playtime: Up to 15 hours on a single charge.
- Total Playtime with Charging Case: Up to 75 hours.

Image Description: This image illustrates the battery life of the Rulefiss BX27 headphones. It shows the charging case providing 75 hours of total playtime and individual earbuds offering 15 hours per single charge. The LED display on the case indicates the battery status.
2. Bluetooth Pairing
- Open the charging case. The earbuds will automatically enter pairing mode.
- Enable Bluetooth on your device (smartphone, tablet, laptop).
- Search for "BX27" in the list of available Bluetooth devices.
- Select "BX27" to connect. Once connected, you will hear an audible confirmation.
The headphones feature Bluetooth 5.4 for a faster and more stable connection with lower power consumption and an extended connection range of up to 20 meters.

Image Description: A technical diagram illustrating the Bluetooth 5.4 rapid automatic pairing feature of the Rulefiss BX27 headphones. It highlights benefits such as lower power consumption, connection distance greater than 15 meters, and faster connection speed.
Operating Instructions
The Rulefiss BX27 headphones utilize touch controls for various functions. Refer to the following table for common operations:
| Function | Action |
|---|---|
| Play/Pause | Single tap on either earbud |
| Next Track | Double tap on the Right earbud |
| Previous Track | Double tap on the Left earbud |
| Volume Up | Triple tap on the Right earbud |
| Volume Down | Triple tap on the Left earbud |
| Answer/End Call | Single tap on either earbud |
| Reject Call | Press and hold either earbud for 2 seconds |
| Activate Voice Assistant (Siri, Google Assistant) | Press and hold either earbud for 3 seconds |

Image Description: A visual guide demonstrating the touch control functions of the Rulefiss BX27 earbuds. It shows various gestures like single tap, double tap, triple tap, and long press for actions such as play/pause, track control, volume adjustment, call management, and voice assistant activation.
Maintenance
Cleaning and Storage
- Regularly clean the earbuds and charging case with a soft, dry cloth.
- Avoid using abrasive cleaners or solvents.
- Store the headphones in their charging case when not in use to protect them from dust and damage.
Water Resistance (IP7)
The Rulefiss BX27 headphones are IP7 waterproof, meaning they are resistant to sweat and splashes. They can withstand immersion in water up to 1 meter for 30 minutes. However, they are not designed for swimming or prolonged submersion. Ensure the earbuds are dry before placing them back in the charging case to prevent damage.

Image Description: A close-up image of a Rulefiss BX27 earbud covered in water droplets, demonstrating its IP7 water resistance. This highlights its suitability for use during workouts or in light rain.
Troubleshooting
| Issue | Possible Solution |
|---|---|
| Cannot pair with device | Ensure earbuds are charged and in pairing mode. Turn off and on Bluetooth on your device. Forget previous connections and try pairing again. |
| No sound from one earbud | Place both earbuds back in the case, close it, then reopen to reset. Check device audio settings. |
| Low volume | Adjust volume on both the earbuds and your connected device. Ensure ear tips provide a good seal. |
| Charging issue | Check USB-C cable and power adapter. Ensure charging contacts on earbuds and case are clean and dry. |
| Unstable connection | Ensure no obstacles between earbuds and device. Keep within 20-meter Bluetooth range. Avoid strong electromagnetic interference. |
Specifications
| Feature | Detail |
|---|---|
| Model Name | X27 |
| Brand | Rulefiss |
| Connectivity Technology | Wireless (Bluetooth) |
| Bluetooth Version | 5.4 |
| Bluetooth Range | 20 Meters |
| Earbud Placement | In-ear with Ear Hooks |
| Driver Size | 14.2 mm Dynamic Driver |
| Frequency Response | 20Hz - 20,000Hz |
| Impedance | 32 Ohm |
| Sensitivity | 108 dB |
| Noise Control | Environmental Noise Cancellation (ENC) with 4 Mics |
| Water Resistance Level | IP7 (Impermeabile) |
| Earbud Weight | 7 Grams |
| Charging Time | 1.5 Hours |
| Average Battery Life (Earbuds) | 15 Hours |
| Average Battery Life (with Case) | 75 Hours |
| Control Method | Touch |
| Compatible Devices | Phones, Laptops, Tablets, Mobile Phones |
| Material | Acrylonitrile Butadiene Styrene (ABS) |

Image Description: This image highlights the comfortable fit of the Rulefiss BX27 headphones for sports. It shows flexible ear hooks, an ergonomic design, and includes illustrations of small, medium, and large ear tips to ensure a personalized and secure fit.

Image Description: An image demonstrating the wide compatibility of the Rulefiss BX27 headphones. Icons represent compatibility with watches, computers, phones, and laptops, indicating versatile use across different devices.
Warranty and Support
Rulefiss products come with a standard manufacturer's warranty. For detailed warranty information, product support, or technical assistance, please refer to the contact information provided on the product packaging or visit the official Rulefiss website. Keep your purchase receipt as proof of purchase for warranty claims.