1. Introduction
Thank you for choosing the A4tech FB35 Bluetooth & 2.4G Wireless Mouse. This versatile mouse offers dual connectivity modes, allowing seamless switching between up to four devices. Designed for comfort and efficiency, it is compatible with PC, Android, iOS, and MAC operating systems. This manual provides detailed instructions for setup, operation, maintenance, and troubleshooting to ensure you get the most out of your new device.
2. Package Contents
- A4tech FB35 Wireless Mouse
- USB Nano Receiver (stored inside the mouse)
- User Manual (this document)
- AA Battery (may be pre-installed or included separately)
3. Product Overview
Familiarize yourself with the key components of your A4tech FB35 mouse:

Figure 3.1: Top View of A4tech FB35 Mouse
- Left/Right Click Buttons: Standard mouse functions.
- Scroll Wheel: For vertical scrolling and middle-click function.
- DPI Adjustment Button: Located below the scroll wheel, allows cycling through DPI settings.
- Side Buttons: Typically function as Forward/Backward in web browsers and file explorers.

Figure 3.2: Bottom View of A4tech FB35 Mouse
- ON/OFF Switch: Located on the bottom of the mouse to conserve battery.
- Optical Sensor: For precise tracking on various surfaces.
- Battery Compartment: Houses the AA battery and storage for the USB Nano Receiver.
4. Setup
4.1. Battery Installation
- Locate the battery compartment on the bottom of the mouse.
- Open the battery cover.
- Insert one AA battery, ensuring correct polarity (+/-).
- Close the battery cover securely.
4.2. Connecting via 2.4G Wireless (USB Receiver)
- Remove the USB Nano Receiver from its storage slot inside the battery compartment.
- Plug the USB Nano Receiver into an available USB port on your computer.
- Turn on the mouse using the ON/OFF switch on the bottom.
- The mouse should automatically connect to your computer. No drivers are typically required.

Figure 4.1: Mouse with USB Nano Receiver
4.3. Connecting via Bluetooth
The A4tech FB35 supports Bluetooth V3.0 and V4.0 and can connect to up to 4 devices.
- Turn on the mouse using the ON/OFF switch.
- Press the Bluetooth pairing button (often located on the bottom or side, or by holding the DPI button) until the indicator light starts blinking, indicating pairing mode. Refer to the specific button on your mouse for Bluetooth channel switching.
- On your device (PC, Android, iOS, MAC), go to Bluetooth settings and search for new devices.
- Select "A4tech FB35" or a similar name from the list of available devices.
- Follow any on-screen prompts to complete the pairing process.
- To switch between paired Bluetooth devices, press the Bluetooth channel switch button (usually the same button used for pairing) to cycle through the connected devices.

Figure 4.2: Dual Connectivity Options
5. Operating Instructions
5.1. Basic Functions
- Left Click: Select items, open links.
- Right Click: Access context menus.
- Scroll Wheel: Scroll up/down documents and web pages. Press for middle-click function.
5.2. DPI Adjustment
The mouse features 4-level adjustable DPI settings (800-1000-1600-2000 DPI) to customize cursor sensitivity. Press the DPI adjustment button, located below the scroll wheel, to cycle through the available settings. Each press will change the DPI level, indicated by a brief change in the scroll wheel LED color or a flash.

Figure 5.1: DPI Adjustment Button
5.3. Side Buttons
The two side buttons on the left side of the mouse provide quick navigation. By default, they function as 'Forward' and 'Backward' in web browsers and file explorers. Their functionality may be customizable through software provided by A4tech (if available for your operating system).

Figure 5.2: Side Buttons
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the mouse. For stubborn dirt, a slightly damp cloth can be used, but ensure no moisture enters the device.
- Battery Replacement: Replace the AA battery when the mouse performance degrades or the low battery indicator (if present) illuminates.
- Storage: When not in use for extended periods, turn off the mouse to conserve battery life. Store the USB Nano Receiver inside the mouse's battery compartment to prevent loss.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Mouse not responding | Battery low or dead; Mouse is off; Connectivity issue. | Replace battery; Turn mouse ON; Re-pair Bluetooth or re-insert USB receiver. |
| Erratic cursor movement | Dirty optical sensor; Unsuitable surface; Interference. | Clean sensor; Use on a smooth, non-reflective surface; Move closer to receiver/device. |
| Cannot connect via Bluetooth | Mouse not in pairing mode; Device Bluetooth off; Already connected to max devices. | Ensure mouse is in pairing mode; Enable Bluetooth on device; Disconnect from other devices. |
| Side buttons not working | Application specific; Driver issue. | Test in different applications; Check for A4tech software/drivers. |
8. Specifications
| Feature | Detail |
|---|---|
| Model | FB35 |
| Connectivity Technology | Bluetooth V3.0/V4.0, 2.4G Wireless |
| DPI Levels | 800 / 1000 / 1600 / 2000 DPI (Adjustable) |
| Movement Detection Technology | Optical |
| Number of Devices Supported | Up to 4 (via Bluetooth) |
| Power Source | 1 x AA Battery |
| Product Dimensions | 23.62 x 23.62 x 33.46 inches (approximate) |
| Item Weight | 2.68 ounces |
| Color | Icy White |
| Manufacturer | A4tech |
| Country of Origin | China |
9. Warranty and Support
For warranty information and technical support, please refer to the documentation included with your purchase or visit the official A4tech website. Warranty terms may vary by region and retailer.
For further assistance, you may contact A4tech customer service through their official channels. Keep your proof of purchase for warranty claims.







