Lenovo 4X31K03931

Overview

The Lenovo 4X31K03931 is a professional wireless keyboard and mouse combo designed to enhance everyday computing with quiet, precise input and long-lasting rechargeable power. The full-size keyboard features scissor switch keys for a soft and accurate typing experience, while the mouse offers an adjustable sensor up to 4000 DPI for detailed control across various tasks. Both devices connect via a single 2.4 GHz dongle or Bluetooth, allowing seamless switching between up to three devices, making this set well suited for multitasking professionals and home office users.

Key features

• Wireless keyboard and mouse that recharge via USB-C, eliminating the need for disposable batteries and reducing interruptions.
• Ability to switch effortlessly among three paired devices using either the 2.4 GHz dongle or Bluetooth connection, supporting flexible workflows.
• Keyboard uses quiet scissor switch keys that reduce typing noise, ideal for shared offices, classrooms, or late-night work sessions.
• Mouse sensor adjustable up to 4000 DPI, allowing precise cursor control for detailed editing or faster movement for general navigation.
• Eight programmable mouse buttons enable customization of shortcuts to speed up frequent commands and improve productivity.
• AES128 encryption secures every keystroke and mouse click, protecting sensitive information during use.
• Constructed with 65 percent recycled materials, supporting sustainability efforts by lowering environmental impact.
• Internal batteries provide up to three months of use on a full charge, minimizing downtime and the hassle of frequent recharging.
• Mouse shell made from bio-rubber offers a comfortable grip for extended use without fatigue.

Key specs

• Wireless connectivity: 2.4 GHz dongle and Bluetooth
• Mouse sensor DPI: adjustable up to 4000 DPI
• Keyboard keys: scissor switch mechanism
• Battery life: up to 3 months per full charge
• Charging port: USB-C for both keyboard and mouse
• Material composition: 65% recycled materials
• Security: AES128 encryption for keystrokes and clicks
• Programmable mouse buttons: 8

Connectivity and compatibility

This combo supports both 2.4 GHz wireless and Bluetooth connections, allowing it to pair with a wide range of devices including computers, tablets, and smartphones. The ability to switch between three devices quickly makes it a versatile choice for users who work across multiple platforms or need to manage different systems without changing peripherals.

• Single USB-C rechargeable dongle for wireless connection
• Bluetooth pairing for additional device compatibility
• Supports up to three devices simultaneously for easy switching

Designed for comfortable and sustainable use

The keyboard’s quiet scissor switches reduce noise, making it suitable for environments where minimal disruption is important. The mouse’s bio-rubber shell enhances comfort during long sessions, while the rechargeable batteries and recycled materials align with eco-conscious practices. This combination fits well in professional settings that value both performance and environmental responsibility.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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