J-Tech Digital V638
J-Tech Digital V638 Ergonomic Wireless Mouse User Manual
Model: V638
Product Overview
The J-Tech Digital V638 Ergonomic Wireless Mouse is designed to provide a comfortable and efficient computing experience. Its unique vertical design reduces wrist and arm strain, making it ideal for extended use. This manual provides detailed instructions for setting up, operating, maintaining, and troubleshooting your new mouse.

Image: The J-Tech Digital V638 Ergonomic Wireless Mouse, showcasing its vertical design and RGB lighting accents.
Key Features
- Ergonomic "handshake" design for reduced strain.
- Removable palm rest for added comfort.
- Wireless 2.4G connection.
- Rechargeable built-in battery.
- Adjustable DPI settings (800, 1200, 1600, 3200).
- Forward/Backward thumb buttons.
- Compatible with Windows, Mac OS, and Linux.
- Three power-saving modes.
Setup Guide
Package Contents
Before you begin, ensure all items are present in the package:
- J-Tech Digital V638 Wireless Vertical Mouse
- Removable Palm Rest
- USB Rechargeable Cable
- User Manual (this document)

Image: Contents of the J-Tech Digital V638 package, including the mouse, palm rest, USB cable, and user manual.
Initial Charging
The mouse comes with a built-in rechargeable battery. For optimal performance, fully charge the mouse before first use.
- Connect the provided USB rechargeable cable to the charging port on the front of the mouse.
- Connect the other end of the USB cable to a USB port on your computer or a USB wall adapter.
- The RGB lights may indicate charging status.

Image: The J-Tech Digital V638 mouse connected to a laptop via its USB charging cable, illustrating the charging process.
Connecting the Mouse
- Locate the USB receiver stored in the slot on the bottom of the mouse.
- Plug the USB receiver into an available USB port on your computer.
- Turn on the mouse using the power switch located on the bottom.
- Your computer should automatically detect and install the necessary drivers.

Image: Underside view of the J-Tech Digital V638 mouse, highlighting the power switch and the USB receiver slot.
Operating Instructions
Button Functions

Image: Diagram illustrating the various buttons and features of the J-Tech Digital V638 mouse, including Left Click, Scroll Wheel, Right Click, DPI Cycle, Removable Palm Rest, Backward, RGB Light Shift, Forward, and Charging Port.
| Button/Feature | Function |
|---|---|
| Left Click | Standard primary click function. |
| Scroll Wheel | Scrolls content vertically. Can also be clicked for middle-click functionality. |
| Right Click | Standard secondary click function (context menu). |
| DPI Cycle Button | Cycles through DPI settings: 800, 1200, 1600, 3200. |
| Forward Button | Navigates forward in web browsers or file explorers. |
| Backward Button | Navigates backward in web browsers or file explorers. |
| RGB Light Shift | Controls the RGB lighting effects. |
| Removable Palm Rest | Provides additional wrist support and can be detached. |
Adjusting DPI
The DPI (Dots Per Inch) setting determines the sensitivity of the mouse cursor. Press the DPI Cycle Button (located near the scroll wheel) to switch between the available sensitivities: 800, 1200, 1600, and 3200 DPI.

Image: A diagram showing the DPI button and the four adjustable DPI levels (800, 1200, 1600, 3200) for the J-Tech Digital V638 mouse.
Power Saving Modes
The V638 mouse features three power-saving modes to conserve battery life:
- Level 1: When the mouse stops moving, it immediately enters sleep mode, and the lights dim. It wakes up upon movement.
- Level 2: If the mouse stops moving for 70 seconds, it enters sleep mode, and the light slowly flashes. It wakes up upon movement.
- Level 3: After 15 minutes of inactivity, the mouse enters deep sleep mode, and the lights turn off. Click any button to wake it up.

Image: The J-Tech Digital V638 mouse on a desk next to a laptop, illustrating the concept of its three power-saving (sleep) modes.
Maintenance and Care
- Keep the mouse clean by wiping it with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
- Ensure the optical sensor on the bottom is free from dust and debris for accurate tracking.
- Store the USB receiver inside the mouse when not in use to prevent loss.
- Avoid exposing the mouse to extreme temperatures or direct sunlight.
- Do not attempt to disassemble the mouse, as this will void the warranty.
Troubleshooting
Mouse Not Responding
- Ensure the mouse is turned on using the power switch on the bottom.
- Check if the USB receiver is securely plugged into a working USB port on your computer. Try a different USB port.
- Recharge the mouse battery. A low battery can cause intermittent connectivity or unresponsiveness.
- If using a USB hub, try connecting the receiver directly to the computer.
- Restart your computer.
Cursor Movement is Erratic or Inaccurate
- Clean the optical sensor on the bottom of the mouse.
- Ensure you are using the mouse on a suitable surface. Highly reflective or transparent surfaces may affect tracking.
- Adjust the DPI setting using the DPI Cycle Button to see if a different sensitivity improves performance.
RGB Lights Not Working
- Press the RGB Light Shift button to cycle through lighting modes or turn them on/off.
- Check the battery level. Lights may dim or turn off in power-saving modes or when the battery is low.
Product Specifications
| Feature | Detail |
|---|---|
| Model | V638 |
| Connectivity | 2.4G Wireless (USB Receiver) |
| DPI Settings | 800 / 1200 / 1600 / 3200 |
| Battery Type | Built-in Rechargeable Lithium Ion |
| Product Dimensions | 5.83 x 3.74 x 3.9 inches (148mm x 95mm x 99mm) |
| Item Weight | 0.67 ounces |
| Compatibility | Windows 7/8/10, XP, Vista 7/8, Linux, Mac OS |
| Color | Black |

Image: The J-Tech Digital V638 mouse with dimensions indicated, showing its height (99mm), length (148mm), and width (95mm).
Warranty and Support
The J-Tech Digital V638 ergonomic mouse includes a One-Year Manufacturer Warranty.
For free lifetime technical support, please contact our US-based Customer Support Team. They are available Monday to Friday, 9 AM to 6 PM CST.
Contact information can be found on the J-Tech Digital Seller Page.

Image: The J-Tech Digital company logo, representing the brand's commitment to quality and support.
J-Tech Digital is dedicated to providing high-quality audio-video solutions and excellent customer support.
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