ASETRERT ASETRERT
HX939W Electric Toothbrush Host User Manual
Model: HX939W | Brand: ASETRERT
1. Introduction
This manual provides essential information for the safe and effective use of your HX939W Electric Toothbrush Host. It is designed as a 4th generation upgrade, offering enhanced durability and multiple cleaning modes for comprehensive oral care. Please read this manual thoroughly before first use and retain it for future reference.
2. Safety Information
To ensure safe operation and prevent injury, please observe the following precautions:
- Do not immerse the host in water beyond its intended use.
- Keep out of reach of children unless under direct adult supervision.
- Do not use if the host appears damaged.
- Use only with compatible brush heads and chargers.
- If you experience any discomfort or pain during use, discontinue immediately and consult a dental professional.
3. Package Contents
Your package should contain the following item:
- 1 x HX939W Electric Toothbrush Host (includes internal circuit board and battery)
Note: A brush head and charger are not included and must be acquired separately for full functionality.
4. Product Overview
The HX939W Electric Toothbrush Host is designed with a thicker and harder material for enhanced durability. It features a single control button and multiple cleaning modes to cater to various oral care needs.
4.1. Key Features
- Durable construction.
- Single button control for power and mode selection.
- Five distinct cleaning modes.
- Charging status indicators.
4.2. Cleaning Modes
The HX939W offers five specialized cleaning modes:
- Cleaning Mode: Lasts 2 minutes. This is the standard mode, optimized for effective plaque removal.
- Whitening Mode: Lasts 2 minutes and 30 seconds. Combines 2 minutes of cleaning with an additional 30 seconds for brightening and polishing the front teeth.
- Polishing Mode: Lasts 1 minute. A quick mode designed for polishing and brightening teeth.
- Gum Health Care Mode: Lasts 3 minutes. Combines 2 minutes of cleaning with 1 minute of gentle stimulation and massage for the gums.
- Sensitive Mode: Lasts 2 minutes. A gentle brushing mode suitable for sensitive teeth and gums, or during periods of increased sensitivity.
4.3. Visual Reference

Figure 1: The HX939W Electric Toothbrush Host, held in hand, showcasing its sleek design and single control button.

Figure 2: A closer view of the HX939W host, highlighting the illuminated mode indicators (Clean, Whitening, Sensitive, Gum Care, Deep Clean).
5. Setup
5.1. Initial Charging
Before first use, fully charge the toothbrush host. Connect a compatible charger (not included) to the host. The indicator light will flash green during charging and turn off automatically when fully charged.

Figure 3: Bottom view of the HX939W host, indicating the charging area. Ensure proper connection with a compatible charger.
5.2. Attaching a Brush Head
Align your compatible brush head with the metal shaft on the top of the host and push it down firmly until it clicks into place.
6. Operating Instructions
6.1. Power On/Off and Mode Selection
The HX93 series features a single button for all operations:
- To Power On: Press the button once. The toothbrush will start in the last used mode or default to Cleaning mode.
- To Switch Modes: While the toothbrush is running, press the button repeatedly to cycle through the five modes (Cleaning, Whitening, Polishing, Gum Health Care, Sensitive).
- To Power Off: If you stay in one mode for a prolonged period (e.g., after the brushing cycle completes), press the button once to shut down the device. If you are actively cycling through modes, you must cycle through all modes to reach the off state, or hold the button down for a few seconds to power off directly.
6.2. Brushing Technique
For optimal results, apply a small amount of toothpaste to the brush head. Place the brush head against your teeth at a slight angle towards the gumline. Move the brush slowly from tooth to tooth, allowing the bristles to clean each surface. Do not scrub vigorously.
6.3. Battery Status Indicators
- Flashing Green: Indicates the device is currently charging.
- Lights Out (after flashing green): Indicates the device is fully charged.
- Flashing Orange: Indicates low battery and that the device needs to be charged soon.
7. Maintenance
7.1. Cleaning the Host
After each use, rinse the brush head thoroughly under running water. Wipe the toothbrush host with a damp cloth to remove any toothpaste residue. Do not use abrasive cleaners or immerse the entire host in water.
7.2. Storage
Store the toothbrush host in a clean, dry place when not in use. Ensure it is fully charged before storing for extended periods to maintain battery health.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Toothbrush does not turn on. | Low or no battery charge. | Charge the toothbrush host until the green light turns off. |
| Mode does not switch. | Incorrect button press sequence. | Press the button briefly to cycle through modes. If you want to turn off, either cycle through all modes or hold the button down. |
| Orange light flashing. | Low battery. | Recharge the toothbrush host. |
9. Specifications
| Attribute | Value |
|---|---|
| Model Number | ASETRERT (HX939W) |
| Manufacturer | ASETRERT |
| Item Weight | 1.76 ounces |
| Package Dimensions | 1.18 x 0.79 x 0.39 inches |
| Number of Pieces | 1 (Host only) |
10. Warranty and Support
For warranty information or technical support, please refer to the seller's policy or contact the manufacturer directly. Keep your purchase receipt as proof of purchase.
For further assistance, please visit the product page on Amazon or contact the seller WCHFJBF-US.
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