1. Introduction
The FMOUSE M303 is a versatile dual-mode wireless mouse designed for enhanced productivity and user experience. It supports both 2.4G wireless via a USB receiver and Bluetooth connectivity, offering flexibility across various devices. Featuring adjustable DPI settings, customizable RGB lighting, and a comfortable ergonomic design, the M303 is suitable for both work and leisure. Its rechargeable battery and Type-C charging port ensure convenience and sustainability.

Figure 1: FMOUSE M303 Wireless Mouse
2. Package Contents
Please check the box for the following items:
- 1 x FMOUSE M303 Wireless Mouse
- 1 x Type-C Charging Cable
- 1 x USB Nano Receiver (stored at the bottom of the mouse)
- 1 x User Manual
3. Specifications
| Feature | Description |
|---|---|
| Brand Name | FMOUSE |
| Model | M303 |
| Type | Bluetooth Wireless (Dual Mode: 2.4G & Bluetooth) |
| Operation Mode | Opto-electronic |
| Number of Buttons | 8 |
| Number of Rollers | 1 |
| DPI Levels | 800 / 1200 / 1600 / 2400 (Adjustable) |
| Interface Type | USB (for 2.4G receiver), Type-C (for charging) |
| Power Type | Rechargeable (Battery Included) |
| Hand Orientation | Right |
| Style | 3D |
| Gross Weight | 100g |
| Certification | CE |
| Product Dimensions (L x W x H) | 100mm x 65mm x 34mm (approx. 3.94in x 2.56in x 1.34in) |

Figure 2: Product Dimensions
4. Setup
4.1. Initial Charging
Before first use, it is recommended to charge the mouse for 2 hours. Connect the provided Type-C charging cable to the mouse's charging port and a USB power source (e.g., computer USB port). The red light beside the scroll wheel will illuminate during charging and turn off when fully charged.

Figure 3: Type-C Charging Port
4.2. Connecting via 2.4G USB Receiver
- Locate the USB Nano Receiver, which is stored in a compartment at the bottom of the mouse.
- Plug the USB Nano Receiver into an available USB port on your computer or device.
- Turn on the mouse using the switch on the bottom. Ensure the switch is set to the "2.4G" or "Receiver Mode" position (indicated by a USB icon).
- The mouse should automatically connect and be ready for use.

Figure 4: Mode Switch (Receiver Mode)
4.3. Connecting via Bluetooth
- Turn on the mouse using the switch on the bottom. Ensure the switch is set to the "Bluetooth" position (indicated by a Bluetooth icon).
- On your computer or device, navigate to Bluetooth settings.
- Search for new Bluetooth devices. The mouse should appear as "FMOUSE M303" or similar.
- Select the mouse to pair. Once paired, the mouse is ready for use.

Figure 5: Mode Switch (Bluetooth Mode)
Video 1: Overview of FMOUSE M303 features including connection modes.
5. Operating Instructions
5.1. DPI Adjustment
The mouse features 4 adjustable DPI levels: 800, 1200, 1600, and 2400. To change the DPI, press the dedicated DPI button located on the top of the mouse for approximately 2 seconds. The RGB lighting may change color to indicate the current DPI setting.

Figure 6: DPI Levels and Indicators
5.2. Volume Adjustment
To adjust the system volume using the mouse:
- Long press the scroll wheel for 3 seconds to activate the volume adjustment interface on your device.
- Roll the scroll wheel up or down to adjust the volume.

Figure 7: Volume Adjustment
5.3. RGB Lighting Effects
The FMOUSE M303 features vibrant RGB backlighting with up to 14 different lighting modes. To cycle through the lighting effects or turn them off, press the dedicated LED button located on the bottom of the mouse.
6. Maintenance
6.1. Charging the Mouse
The mouse is equipped with a rechargeable battery. When the battery is low, the indicator light below the DPI button will flash red. Connect the mouse to a power source using the provided Type-C charging cable. It is recommended to charge the mouse via a computer's USB interface for optimal battery health. The red light beside the scroll wheel will be on during charging and will turn off once fully charged.
6.2. Cleaning
To clean your mouse, gently wipe its surface with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials that could damage the finish or internal components.
7. Troubleshooting
- Mouse cursor moves slowly or stops: This indicates a low battery. Please recharge the mouse using the Type-C charging cable.
- Connection fails (2.4G or Bluetooth):
- Turn off the mouse.
- For 2.4G mode, remove and reinsert the USB Nano Receiver into your computer.
- Turn on the mouse and try connecting again.
- Mouse enters sleep mode: The mouse is designed to enter sleep mode after 8 minutes of inactivity to conserve battery. Simply click any button to wake it up.
8. User Tips
- For optimal battery life, always charge the mouse when the low power indicator flashes red.
- When switching between 2.4G and Bluetooth modes, ensure the switch on the bottom of the mouse is correctly positioned for the desired connection type.
- The ergonomic design is intended for right-hand use, providing comfort and reducing wrist strain during prolonged use.

Figure 8: Ergonomic Design for Comfortable Use
9. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the contact information provided by your retailer or visit the official FMOUSE website. Keep your purchase receipt as proof of purchase.





