1. Introduction
Thank you for choosing the Kuizil HD65 Wireless Earbuds. This manual provides detailed instructions for setting up, operating, and maintaining your new earbuds. Please read it carefully before use to ensure optimal performance and longevity of your device.

2. Package Contents
Ensure all items are present in the package:
- 1 x Charging Case
- 2 x Wireless Earbuds (Left and Right)
- 1 x Type-C Charging Cable
- 1 x User Manual (PDF available at User manual (PDF))
- 4 x Earbud Tips (Replaceable Pads Set)

3. Product Specifications
| Feature | Specification |
|---|---|
| Brand Name | Kuizil |
| Model | HD65 |
| Category | Earphones & Headphones |
| Material | Plastic, Silicone (Headphone Pads) |
| Bluetooth Version | 5.4 |
| Communication | Wireless (Bluetooth) |
| Connectors | Type C |
| Style | TWS In-ear Headphones |
| Features | With microphone, Control Button, Volume Control |
| Vocalism Principle | Dynamic |
| Driver Diameter | 14.2mm |
| Battery Capacity (Charging Case) | 535mAh |
| Total Playtime (with Charging Case) | Up to 75 hours |
| Single Charge Playtime | 15 hours |
| Charging Time (Earbuds) | 1.5 hours |
| Charging Time (Charging Case) | 2 hours |
| Maximum Wireless Range | 10m-20m (without obstacles) |
| NFC Technology | No |
| Waterproof Rating | IPX7 |
| Certification | CE, FCC, RoHS |
| Support Protocols | HFP/A2DP/HSP/AVRCP |
| Resistance | 32Ω |
4. Product Overview
Familiarize yourself with the components of your HD65 Wireless Earbuds:



5. Setup and Pairing
Before first use, ensure both earbuds and the charging case are fully charged.
5.1 Initial Pairing
- Power On: Take both earbuds out of the charging case. They will automatically power on and enter pairing mode. If not connected to a device for more than 5 minutes, they will turn off. To manually turn on, press the MFB button for about 3 seconds until you hear "Power on."
- Earbud Interconnection: After powering on, the earbuds will prompt "pairing." The left earbud's ice blue light will flash slowly, and the right earbud's light will go out, indicating successful inter-earbud pairing.
- Connect to Phone: Enable Bluetooth on your phone. Search for "HD65" in the list of available devices and select it to connect. You should hear a voice prompt "Connected" when wearing the earbuds.
If the indicator light on the earbud is off, it means the phone is connected.
5.2 Automatic Connection
By default, the earbuds will automatically connect to the last paired phone when powered on.
5.3 Single Earbud Use
The earbuds can be used individually. To use a single earbud, simply take one out of the case and connect it to your phone. If using both and you wish to switch to single mode, manually turn off one earbud or place it back in the charging case.
6. Operating Instructions
The HD65 earbuds feature convenient physical buttons for control.
6.1 Telephone Communication
- Answer Call: Tap the MFB button once.
- Hang Up: Tap the MFB button once.
- Refuse Incoming Call: Press and hold the MFB button for 2 seconds.
6.2 Music Control
- Play/Pause: Tap the MFB button once.
- Previous Track: Tap the Left MFB button twice.
- Next Track: Tap the Right MFB button twice.
- Activate Siri (Voice Assistant): Quickly tap the MFB button three times.
- Turn Down Volume: Press and hold the Left MFB button.
- Turn Up Volume: Press and hold the Right MFB button.
7. Charging
7.1 Earbuds Charging
The earbuds will only charge when correctly placed in the charging slots of the case. You can charge the case and earbuds simultaneously, or charge the case first and then the earbuds.
- The indicator light on the earbuds will show white when charging.
- The charging case will automatically stop charging, and the earbud indicator lights will turn off when fully charged.
- While charging, the digital display bar of the case will blink and turn off when the earbuds are fully charged.

7.2 Case Charging
Use the provided Type-C USB charging cable to charge the case directly.
- During charging, the digital display on the case will flash, showing the battery level in real-time.
- When fully charged, the display will show "100".
8. Storage and Maintenance
- If the earbuds are not used for more than 3 months, it is recommended to charge them to maintain battery health.
- Always use a charger approved by FCC (Federal Communications Commission).
- Do not disassemble the earbuds.
- Children aged 12 and under should use the earbuds under adult supervision.
- Avoid exposing the earbuds to extreme high or low temperatures. Do not use them during thunderstorms.
- Protect the device from free falls or violent shocks. Keep it away from fire sources and do not immerse it in water.
9. Troubleshooting (Frequently Asked Questions)
Q: Why don't these earbuds pair with my phone?
A: Ensure the earbuds are fully charged and powered on, and your phone's Bluetooth is enabled. If issues persist, turn off the powered-on earbuds with 5 quick clicks, place them back in the charging case, close the lid, wait 1 minute, then open the case and reconnect.
Q: Why does the music cut in or out?
A: First, ensure the earbuds are within 10 meters of your phone without obstacles. If the distance is less than 10m and the issue occurs:
- Place the earbuds back in the case, close the lid, and "forget" the device "HD65" in your phone's Bluetooth settings.
- After 10 seconds, open the charging case and re-pair the earbuds with your phone.
Q: Why won't the earbuds charge or disconnect from the phone when placed in the case?
A: Make sure the charging case itself is not in a low battery state. If the case battery is low, the earbuds may not charge or disconnect properly. Use a Type-C charging cable to fully charge the case.
Q: Are these earbuds sweat- and water-resistant?
A: Yes, these earbuds are sweatproof and IPX7 waterproof. However, for electronic devices, we do not recommend submerging them in water. They are not resistant to hot water or steam, which can damage internal components.
Q: What if the earbuds are not charging or turning on after a long period of disuse?
A: This might be due to oxidation of the magnet connectors. Clean the magnet contacts on both the earbuds and the charging case with an alcohol wipe to resolve this.
10. User Tips
- Always ensure your earbuds are fully charged before an important activity to maximize playtime.
- For the most stable Bluetooth connection, try to keep your connected device within 10 meters of the earbuds and minimize physical obstructions.
- If you experience any connectivity or charging issues, a quick clean of the charging contacts with an alcohol wipe can often resolve the problem.
- When storing the earbuds for extended periods, give them a full charge every few months to preserve battery life.
11. Warranty & Support
Kuizil offers permanent replacement for damaged, defective items, or missing components. To activate your warranty, please email amazon.seller9966@gmail.com within 15 days of purchase.
For more detailed product FAQs or further assistance, please contact our customer service team via the provided email address.