Introduction
This manual provides essential instructions for setting up, operating, maintaining, and troubleshooting your Finalmouse Starlight-12 Poseidon Small wireless gaming mouse. Please read this manual thoroughly to ensure optimal performance and longevity of your device.

Image: The Finalmouse Starlight-12 Poseidon Small, showcasing its unique design and magnesium chassis.
1. Setup Guide
1.1 Unboxing and Initial Inspection
Carefully remove the Finalmouse Starlight-12 Poseidon Small from its packaging. Inspect the mouse for any visible damage. Ensure all components are present.

Image: The product packaging for the Finalmouse Starlight-12 Poseidon, featuring a distinctive trident design.
1.2 Connecting the Mouse
- Locate the USB wireless receiver included with your mouse.
- Plug the USB receiver into an available USB port on your computer.
- Turn on the mouse using the power switch located on the underside of the device.
- Your computer should automatically detect and install the necessary drivers. If not, visit the official Finalmouse website for driver downloads.
1.3 Initial Charging
Although the mouse may have some charge out of the box, it is recommended to fully charge it before first use to ensure optimal battery life. Connect the provided USB charging cable to the mouse and a powered USB port on your computer or a USB wall adapter.
2. Operating Instructions
2.1 Basic Mouse Functions
- Left Click: Primary action, selection.
- Right Click: Context menu, secondary action.
- Scroll Wheel: Vertical scrolling, middle click.
- Side Buttons: Typically configured for forward/back navigation in web browsers or custom functions in games.
2.2 Finalsensor Technology
The Starlight-12 Poseidon features the Finalsensor, an industry-leading esports sensor designed for flawless performance. Key characteristics include:
- Resolution (CPI): Up to 20,000 CPI for precise tracking.
- IPS: Approximately 450+ Inches Per Second, ensuring accurate tracking even during rapid movements.
- Integrated Illumination: Provides visual feedback and enhances aesthetics.

Image: Top-down view of the Finalmouse Starlight-12 Poseidon Small, highlighting the illuminated scroll wheel and the detailed magnesium chassis.
2.3 Rest Mode Functionality
To conserve battery life, the Finalsensor is designed to enter various stages of rest mode after periods of inactivity. If the mouse is idle, it will transition into a rest mode. Moving the mouse will reactivate it. Note that testing the mouse from a standstill while it is in a rest mode will not accurately reflect its real-time latency performance.
3. Maintenance
3.1 Cleaning Your Mouse
To maintain optimal performance and appearance, clean your mouse regularly:
- Use a soft, dry, lint-free cloth to wipe the surface of the mouse.
- For stubborn dirt, slightly dampen the cloth with water or a mild electronics cleaner. Avoid harsh chemicals.
- Use compressed air to clear dust and debris from around the scroll wheel and sensor area.
3.2 Chassis and Base Care
The Starlight-12 Poseidon features a magnesium chassis and an Ultem base. The magnesium chassis is durable, but the Ultem base, designed to allow wireless signals to escape, is not as strong. Avoid squeezing or applying excessive pressure to the bottom of the mouse to prevent damage.
4. Troubleshooting
4.1 Mouse Not Responding
- Ensure the mouse is powered on.
- Verify the USB receiver is securely plugged into a working USB port. Try a different USB port.
- Check the mouse battery level. Recharge if necessary.
- Restart your computer.
4.2 Inconsistent Tracking or Lag
- Ensure the mouse sensor is clean and free of debris.
- Use the mouse on a clean, uniform surface, preferably a high-quality mouse pad.
- Ensure the USB receiver is not obstructed and is within close proximity to the mouse. Avoid placing it near other wireless devices that may cause interference.
- Allow the mouse to fully wake from rest mode before assessing performance.
4.3 Weight Variation
Due to the manufacturing processes and complexities involved with the magnesium chassis, the weight of each individual mouse may vary slightly. For the Small size, the final assembled weight, including battery, feet, screws, paint, and coating, is approximately 42 grams. This slight variation (typically +/- 2 grams) is normal and does not indicate a defect.
5. Product Specifications
| Feature | Detail |
|---|---|
| Model | Starlight-12 Poseidon Small |
| Brand | FinalMouse |
| Chassis Material | Magnesium Alloy |
| Base Material | Ultem |
| Connectivity | Wireless (USB Receiver) |
| Movement Detection | Laser (Finalsensor) |
| Max CPI | 20,000 |
| Max IPS | ~450+ |
| Approximate Weight (Small) | 42 grams (1.48 ounces) |
| Package Dimensions | 5.59 x 4.25 x 2.83 inches |
| Date First Available | April 25, 2022 |
6. Warranty Information
Finalmouse products are typically covered by a limited manufacturer's warranty. For detailed information regarding the warranty period, coverage, and terms and conditions for your Starlight-12 Poseidon Small mouse, please refer to the warranty card included with your product or visit the official Finalmouse website. Keep your proof of purchase for warranty claims.
7. Customer Support
If you encounter any issues not covered in this manual or require further assistance, please contact Finalmouse customer support. You can usually find contact information, FAQs, and additional resources on the official Finalmouse website:




