Introduction
The Kuizil SU9 Sleep Earbuds are meticulously designed to provide a comfortable and undisturbed sleep experience, especially for side sleepers. These earbuds feature advanced Bluetooth 5.4 connectivity, IPX7 waterproofing, and a smart touch screen charging case, offering up to 48 hours of playtime. With their ergonomic, ultralight design and noise-blocking capabilities, the SU9 earbuds help you achieve a peaceful night's sleep or focus during the day by isolating distractions.
Video: Introduction to SU9 Sleep Earbuds features and benefits.
What's in the Box
Please check the package contents upon unboxing:
- 2 x SU9 Sleep Earbuds
- 1 x Charging Case
- 1 x User Manual
- 1 x USB-C Charging Cable
- 2 x pairs of Earcaps (Replaceable Pads Set)

Image: Diagram showing all items included in the SU9 Sleep Earbuds package.
Specifications
| Feature | Specification |
|---|---|
| Brand Name | Kuizil |
| Model | SU9 |
| Material | Plastic |
| Battery Capacity | 470mAh |
| Battery life up to | 48 hours (with charging case) |
| Single Charge Playtime | 6-8 hours |
| Charging Time | Approx. 1.5 hours |
| Maximum wireless range | 10m-20m |
| Sound Isolating | Yes |
| Charging Method | Charging case (Type-C) |
| Headphone Pads Material | Silicone |
| Bluetooth Version | 5.3 |
| Features | With microphone, Smart Touch Screen |
| Waterproof Rating | IPX7 |
| Function | For Video Game, For Sleep |
| Active Noise-Cancellation | Yes |
| Volume Control | Yes |
| Control Button | Yes |
| Vocalism Principle | Dynamic |
| Wireless Type | Bluetooth |
| Connectors | Type C |
| Communication | Wireless |
| Style | TWS In-ear Headphones |
| Certification | CE, FCC, RoHS |
| Resistance | 32 Ohm |
| Earbud Weight | Approx. 3.0g per earbud |
Setup
1. Charging the Earbuds and Case
Before first use, fully charge the SU9 Sleep Earbuds and their charging case. Connect the provided USB-C charging cable to the charging port on the case and a power source. The smart touch screen on the case will display the charging status and battery levels for both earbuds and the case.

Image: Charging information for SU9 Sleep Earbuds, indicating battery life and charging duration.
2. Wearing the Earbuds
For optimal comfort and sound isolation, ensure the earbuds are properly fitted in your ears.
- Select the appropriate ear tips from the provided set that best fit your ear canal.
- Place the ear cap downwards and gently insert the earbud into your ear canal.
- Slightly rotate the earbud to ensure a secure and comfortable fit.

Image: Step-by-step guide on how to properly wear the SU9 Sleep Earbuds.
3. Bluetooth Pairing
The SU9 Sleep Earbuds feature one-step pairing for convenience.
- Open the charging case. The earbuds will automatically enter pairing mode.
- On your device (smartphone, tablet, etc.), enable Bluetooth.
- Search for available Bluetooth devices and select "SU9" from the list.
- Once connected, the earbuds are ready for use.
Operating Instructions
Smart Touch Screen Functions (Charging Case)
The charging case features an LED smart touch screen that allows you to control various settings and functions directly. Navigate the interface by swiping and tapping.
- Sleep Mode: Activate to disable earbud touch controls, silence alerts, and block calls for uninterrupted sleep.
- EQ Modes: Choose from five equalizer presets: Normal, Jazz, Rock, Pop, and Classics.
- Find My Earphone: Locate misplaced earbuds by activating an audible signal.
- Volume Control: Adjust the overall volume level (16 settings available).
- Language Switch: Select from 7 different language options.
- Play Music: Control music playback directly from the screen.
- Screen Lock: Prevent accidental touches on the screen.
- Power Off/Reset/Factory Reset: Manage earbud power and reset options.
- Income: Manage incoming calls.

Image: Overview of the smart touch screen interface on the SU9 charging case.
Earbud Touch Controls
The earbuds themselves feature intuitive touch controls for common functions. Note that Sleep Mode is not available when using only one earbud. If the primary earbud is turned off, the secondary earbud will automatically exit sleep mode.
- Sleep Modes: Click 4 times (Left or Right earbud)
- Voice Assistant: Triple click (Left or Right earbud)
- Play/Pause: Double click (Left or Right earbud)
- Volume -/+: Click 1 time (Left for decrease, Right for increase)
- Previous/Next Song: Long Press 2 seconds (Left for previous, Right for next)
- Answer Call: Click 1 time (Left or Right earbud)
- Reject/Hang Up Call: Long Press 2 seconds (Left or Right earbud)

Image: Detailed guide to earbud touch controls for music, calls, and special modes.
Maintenance
To ensure the longevity and optimal performance of your SU9 Sleep Earbuds, follow these maintenance guidelines:
- Cleaning: Regularly clean the earbuds and charging case with a soft, dry, lint-free cloth. Avoid using abrasive materials, solvents, or harsh chemicals.
- Ear Tips: Remove and clean the silicone ear tips periodically with mild soap and water. Ensure they are completely dry before reattaching.
- Storage: When not in use, always store the earbuds in their charging case to protect them from dust, damage, and to keep them charged.
- Water Exposure: While the earbuds are IPX7 waterproof (protected against temporary immersion in water up to 1 meter for 30 minutes), they are not designed for swimming, showering, or prolonged submersion. Dry them thoroughly if they get wet.
Troubleshooting
If you encounter any issues with your SU9 Sleep Earbuds, please refer to the following common solutions:
- Earbuds not pairing/connecting:
- Ensure both earbuds are charged and removed from the charging case.
- Turn off and then on your device's Bluetooth.
- Forget the "SU9" device from your device's Bluetooth list and attempt to re-pair.
- Perform a factory reset via the charging case's smart touch screen.
- No sound or low volume:
- Check the volume levels on both your connected device and the earbud touch controls/charging case screen.
- Ensure the earbuds are properly seated in your ears.
- Confirm the earbuds are connected to the correct audio output on your device.
- Touch controls unresponsive:
- Ensure the earbuds are not in Sleep Mode, which disables touch controls.
- Clean the touch sensor areas on the earbuds to remove any dirt or debris.
- Restart the earbuds by placing them back in the case and taking them out again.
- Short battery life:
- Ensure the earbuds and charging case are fully charged before use.
- High volume levels or continuous use of features like Active Noise Cancellation can reduce battery life.
- Check for any background apps on your connected device that might be draining power.
User Tips
Maximize your experience with the SU9 Sleep Earbuds with these helpful tips:
- Optimal Comfort for Sleep: Experiment with the different sized ear tips to find the most comfortable and secure fit for side sleeping. The feather-light design (approx. 3.0g per earbud) is specifically engineered to minimize pressure.
- Utilize Sleep Mode: For truly undisturbed rest, activate the dedicated Sleep Mode via the charging case's smart screen. This feature silences alerts and disables touch controls, preventing accidental interruptions.
- Personalize Your Sound: Explore the five different EQ modes (Normal, Jazz, Rock, Pop, Classics) available through the smart touch screen to find your preferred audio profile for music or ambient sounds.
- Long Playtime Management: With up to 48 hours of total playtime, you can enjoy multiple nights of use without needing to recharge the case. A single charge provides 6-8 hours, perfect for a full night's sleep.
- Stay Connected (or not): Use the smart touch screen to manage calls or activate the 'Find My Earphone' feature if an earbud goes missing.
Warranty and Support
For warranty information, technical support, or service inquiries, please contact the seller or manufacturer directly. Keep your proof of purchase for any warranty claims.

