1. Introduction
This manual provides detailed instructions for setting up and operating your acer Wireless Mouse OMR266 and acer Wireless Mouse OMR242. These mice offer reliable 2.4GHz wireless connectivity and adjustable DPI settings for enhanced productivity.

Image 1.1: The acer Wireless Mouse OMR266 (left) and OMR242 (right) included in the bundle, along with their respective USB receivers.
2. Package Contents
- 1 x acer Wireless Mouse OMR266
- 1 x USB-A Receiver for OMR266
- 1 x acer Wireless Mouse OMR242
- 1 x USB-A Receiver for OMR242
- Instruction Manual (this document)
Note: AAA batteries are not included and must be purchased separately for both mice.
3. Getting Started
3.1. Battery Installation
- Locate the battery compartment on the underside of the mouse.
- Open the battery compartment cover.
- Insert two AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.

Image 3.1: Underside view of the acer OMR242 mouse, showing the battery compartment for two AAA batteries and the USB receiver storage slot.
3.2. Connecting the USB Receiver
- Remove the USB-A receiver from its storage slot, typically located within the battery compartment or near it.
- Plug the USB-A receiver into an available USB-A port on your computer.
- The mouse is plug-and-play; no additional drivers are required.

Image 3.2: The acer OMR242 mouse in use, demonstrating its compatibility with devices featuring a USB-A port via its wireless receiver.
3.3. Powering On the Mouse
Locate the power switch on the underside of the mouse and slide it to the 'ON' position. The mouse should now be ready for use.
4. Operating Instructions - acer Wireless Mouse OMR266
4.1. 2.4GHz Wireless Connection
The OMR266 mouse utilizes 2.4GHz wireless technology, providing a stable and interference-free connection up to 32 feet (approximately 10 meters). Simply plug the USB-A receiver into your computer, and the mouse will connect automatically.

Image 4.1: The acer OMR266 mouse connected wirelessly to a laptop, illustrating its 2.4GHz stable connection with a range of up to 32 feet.
4.2. Adjustable DPI Settings
The OMR266 mouse features three adjustable DPI (Dots Per Inch) settings: 800, 1200, and 1600. DPI controls the sensitivity of the mouse cursor. To switch between DPI levels, press the DPI button located near the scroll wheel. Each press cycles through the available settings.
- 800 DPI: Lower sensitivity for precise tasks.
- 1200 DPI: Standard sensitivity for general use.
- 1600 DPI: Higher sensitivity for faster cursor movement.

Image 4.2: The acer OMR266 mouse highlighting its three adjustable DPI levels: 800, 1200, and 1600, for customized cursor sensitivity.
4.3. Forward and Backward Buttons
The OMR266 mouse is equipped with dedicated forward and backward buttons on its side. These buttons allow for quick navigation through web pages and file directories, enhancing workflow efficiency.
- Press the Forward button to navigate to the next page or folder.
- Press the Backward button to return to the previous page or folder.

Image 4.3: The acer OMR266 mouse with its forward and backward navigation buttons clearly labeled for easy web page and file browsing.
4.4. Visible Indicator Light
The OMR266 mouse includes a visual indicator light that provides feedback on DPI levels and battery status.
- DPI Indication:
- Red light flashes once for 800 DPI.
- Red light flashes twice for 1200 DPI.
- Red light flashes three times for 1600 DPI.
- Low Battery Alert: When the battery level drops below 10%, the red light will flash continuously until the mouse loses power.

Image 4.4: The acer OMR266 mouse displaying its visible indicator light, which flashes red when the battery level is below 10%.
5. Operating Instructions - acer Wireless Mouse OMR242
5.1. 2.4GHz Wireless Connection
The OMR242 mouse also uses 2.4GHz wireless technology for a stable and reliable connection. Insert the USB-A receiver into your computer's USB port, and the mouse will establish a connection automatically without needing additional drivers.

Image 5.1: The acer OMR242 mouse connected wirelessly to a laptop, demonstrating its 2.4G wireless, lag-free connection for plug-and-play use.
5.2. Adjustable DPI Settings
The OMR242 mouse offers three adjustable DPI settings: 800, 1200, and 1600. These settings allow you to customize the cursor sensitivity to suit your preferences and tasks. Press the DPI adjustment button, located near the scroll wheel, to cycle through the sensitivity levels.
- 800 DPI: For precise control.
- 1200 DPI: Balanced for everyday use.
- 1600 DPI: For faster cursor movement.

Image 5.2: The acer OMR242 mouse illustrating its 3-level adjustable DPI feature, allowing users to change cursor sensitivity between 800, 1200, and 1600 DPI.
5.3. Button Description
The OMR242 mouse features standard buttons for navigation and interaction:
- Left Button: Primary click function.
- Scroll Wheel: For vertical scrolling and middle-click function.
- Right Button: Secondary click function (context menu).
- DPI Adjustment Button: Changes cursor sensitivity.

Image 5.3: A diagram of the acer OMR242 mouse, labeling its left button, scroll wheel, right button, and DPI adjustment button.
6. Maintenance
6.1. Cleaning
To maintain optimal performance, regularly clean your mouse:
- Use a soft, dry cloth to wipe the exterior of the mouse.
- For stubborn dirt, slightly dampen the cloth with water or a mild cleaning solution (avoid harsh chemicals).
- Do not allow liquids to enter the mouse's interior.
- Clean the optical sensor on the underside with a cotton swab if cursor movement becomes erratic.
6.2. Battery Replacement
Replace the AAA batteries when the low battery indicator (for OMR266) activates or when mouse performance degrades. Refer to Section 3.1 for battery installation instructions.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Mouse is unresponsive | Low or dead batteries | Replace batteries with fresh AAA batteries. |
| Mouse is unresponsive | USB receiver not properly connected | Ensure the USB receiver is firmly plugged into a working USB-A port. Try a different port. |
| Mouse is unresponsive | Mouse is powered off | Slide the power switch on the underside of the mouse to the 'ON' position. |
| Erratic cursor movement | Dirty optical sensor | Clean the optical sensor on the underside of the mouse with a cotton swab. |
| Erratic cursor movement | Using mouse on unsuitable surface | Use the mouse on a clean, non-reflective, opaque surface or a mouse pad. |
| Wireless connection issues | Interference from other wireless devices | Move the mouse closer to the USB receiver. Avoid placing the receiver near other wireless devices or large metal objects. |
8. Product Specifications
| Feature | Specification |
|---|---|
| Brand | acer |
| Models | OMR266, OMR242 |
| Connectivity Technology | 2.4GHz Wireless (USB-A Receiver) |
| Movement Detection Technology | Optical |
| Adjustable DPI | 800, 1200, 1600 |
| Wireless Range | Up to 32 feet (10 meters) |
| Power Source | 2 x AAA Batteries (not included) |
| Color | Black |
9. Warranty and Support
acer products are designed for reliability and performance. For warranty information, technical support, or service inquiries, please refer to the official acer website or contact acer customer support directly. Keep your purchase receipt as proof of purchase for warranty claims.
For further assistance, visit: www.acer.com/support