1. Introduction
This manual provides essential information for the safe and effective use of your ENGFYADSY USB Charger for Braun Oral-B Electric Toothbrushes. Please read these instructions carefully before use and retain them for future reference. This charger is designed to provide a convenient and waterproof inductive charging solution for compatible Oral-B electric toothbrushes, ideal for both home use and travel.
2. Product Overview
The ENGFYADSY USB Charger is a compact, inductive charging base featuring a USB Type-A connector. It is engineered for compatibility with a wide range of Braun Oral-B electric toothbrushes, offering a waterproof design and multiple safety protections. Its portable nature makes it suitable for travel, allowing charging via various USB power sources.

Image 2.1: The ENGFYADSY USB charger, a white inductive charging base with an integrated USB-A cable.
3. Compatibility
This charger is compatible with a broad range of Braun Oral-B electric toothbrush models. Please verify your toothbrush model against the list below before use.

Image 3.1: Visual representation of various compatible Oral-B electric toothbrush models.
Compatible Models Include:
- D Series: D12, S12, S18, D10, D16, D17, D18, D19, D20, D29, D34, D36, D12013, D12013w, D12523 series
- OC Series: OC18, OC20
- Professional Series: 500, 600, 1000, 2000, 300, 7000, 3709, 3728, 3737, 3756, 4736, 4717, 4729, 4733, 6500, 8000, 8850, 8900, 9000, 9000s
This charger is designed to fit all Oral-B round head electric toothbrushes that utilize inductive charging.
4. Key Features
4.1. IP67 Waterproof Design
The charger features a fully sealed IP67 waterproof design, allowing for safe use in humid environments and easy cleaning with water. This protection prevents damage from accidental water exposure.

Image 4.1: The charger demonstrating its waterproof capability, with water splashing near it.
4.2. Inductive Charging
The charger utilizes wireless inductive charging technology, eliminating the need for metal contacts. Simply place your compatible toothbrush onto the charging base to initiate charging. The system supports smart induction trickle charging.

Image 4.2: An electric toothbrush being charged wirelessly on the inductive charging base.
4.3. Multiple Safety Protections
The charger incorporates several safety mechanisms to ensure secure operation and protect your device:
- Over-Charging Protection
- Short-Circuit Protection
- Over Load Protection
- Over Voltage Protection
- Over Current Protection
- Temperature Protection
- Fire-Resistance Shell
- Smart IC Chip Protection

Image 4.3: Icons representing the various safety protections integrated into the charger.
4.4. Portable and Travel-Friendly Design
With its compact size and USB power input, the charger is highly portable. It supports 100V-240V voltage input, making it suitable for international travel when paired with an appropriate USB power adapter. The integrated USB cable offers flexible connection options.

Image 4.4: Close-up of the USB Type-A connector, highlighting its universal compatibility with USB power sources.

Image 4.5: Examples of the compact charger being easily stored in bags and luggage for travel.
5. Setup
- Unpack: Carefully remove the USB charger from its packaging.
- Connect to Power: Insert the USB Type-A connector into a compatible USB power source. This can be a USB wall adapter (not included), a power bank, a computer USB port, or a car charger. Ensure the power source provides sufficient output (e.g., 5V/1A).
- Placement: Place the inductive charging base on a stable, flat surface.
6. Operating Instructions
- Initiate Charging: Once the charger is connected to a power source, gently place your compatible Braun Oral-B electric toothbrush onto the charging pin of the inductive base.
- Charging Indication: Your toothbrush should indicate that it is charging (e.g., a blinking light on the toothbrush handle). Refer to your toothbrush's specific manual for its charging indicator behavior.
- Completion: The toothbrush will typically stop charging automatically once fully charged, or the charging indicator will change. The inductive charger is designed to automatically power off when the toothbrush is removed.
7. Maintenance
- Cleaning: Due to its IP67 waterproof rating, the charger can be easily cleaned with a damp cloth or rinsed under running water. Ensure the USB connector is dry before plugging it into a power source.
- Storage: Store the charger in a cool, dry place when not in use. Avoid extreme temperatures.
- Inspection: Periodically inspect the charger and cable for any signs of damage. Do not use if the cable is frayed or the base is cracked.
8. Troubleshooting
- Toothbrush Not Charging:
- Ensure the USB cable is securely connected to a working power source.
- Verify that your toothbrush model is listed as compatible.
- Confirm the toothbrush is correctly seated on the charging pin.
- Try a different USB power adapter or port.
- Charger or Toothbrush Feels Warm During Charging:
- A slight warmth is normal during inductive charging.
- If the charger or toothbrush becomes excessively hot, immediately disconnect it from the power source and discontinue use. Contact customer support if this persists.
- Intermittent Charging:
- Check for any debris on the charging base or the bottom of the toothbrush that might interfere with the inductive connection.
- Ensure the toothbrush is stable and not wobbling on the base.
9. Specifications

Image 9.1: Diagram illustrating the dimensions of the USB charger.
| Feature | Specification |
|---|---|
| Model Number | WY3757B |
| Input Voltage | 100-240 Volts (via USB power source) |
| Amperage | 0.1 Amps |
| Wattage | 10 Watts |
| Connector Type | USB Type A |
| Waterproof Rating | IP67 |
| Cable Length | 1 meter / 39.37 inches |
| Item Weight | 2.99 ounces |
| Package Dimensions | 4.06 x 2.28 x 2.2 inches |
| Included Components | USB Charger |
10. Warranty and Support
For warranty information or technical support, please refer to the product packaging or contact the seller directly. Keep your purchase receipt as proof of purchase. The manufacturer aims for 100% satisfaction and typically offers online service and a money-back guarantee within a specified period.