Xiaomi's New $28 Mouse Tracks on Glass and Has a Magnetic Scroll Wheel
Xiaomi NewsTuesday, 07 July 2026 at 11:08
Most mice that work on glass surfaces cost significantly more than $28. Most mice with electromagnetic scroll wheels cost even more than that. The Xiaomi Wireless Mouse 4 Pro just went on sale in China combining both features in a single lightweight peripheral — and the price is hard to argue with.
Summary
- TOG glass-surface sensor: Tracks accurately on glass at least 4mm thick — no mouse pad needed in most setups.
- Dynamic electromagnetic scroll wheel: Automatically switches between stepped and free-spin scrolling based on how fast you move your finger.
- Three-device connectivity: 2.4GHz wireless plus two Bluetooth channels, switchable on the fly.
- 66g without battery, 115.5 × 62 × 36.5mm: Compact form factor for small to medium hands.
- 199 CNY (~$28), China only for now: Black and White color options, receiver stores magnetically inside the mouse.
Glass Tracking at This Price Is Unusual
The TOG sensor is the standout spec. Tracking on glass surfaces has historically required either a mouse pad or a premium sensor — Logitech's Darkfield technology, found on mice starting around $80-100, is the best-known example. Xiaomi's TOG sensor works on glass at least 4mm thick, which covers most tempered glass desk protectors and glass tabletops. Combined with an optimized tracking algorithm, the cursor movement stays consistent across wood, fabric, and glass alike.
For a home or office user who works on a glass desk or regularly moves between surfaces, eliminating the mouse pad is a practical convenience, not just a spec sheet bullet point.
The Scroll Wheel Is the Other Story
Logitech charges a premium for its MagSpeed electromagnetic scroll wheel, which appears in the MX Master 3 at around $100. Xiaomi's implementation works on the same principle — the wheel automatically detects scrolling speed and switches between stepped mode for precise navigation and free-spin mode for flying through long documents or web pages. The transition is seamless, and there are no buttons to press or modes to set manually. It just adapts.
This kind of scroll wheel makes a real difference in productivity. Fast-spin mode through a 200-page document takes less than two seconds. Stepped mode through a dropdown menu stays precise. Having both behaviors in one wheel — at $28 — is the kind of value gap that usually narrows when a product reaches global markets.
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Connectivity and Design
Three simultaneous device connections via 2.4GHz and two Bluetooth channels means desktop, laptop, and tablet users can stay on one mouse without re-pairing. The receiver stores magnetically inside the mouse itself when not in use — a small but thoughtful detail for travel. Web-based driver configuration requires no software installation, which matters for users working on locked-down corporate machines.
At 66g without battery and just 115.5 × 62 × 36.5mm, it's compact. The size targets small to medium hands specifically, so anyone with a larger grip may want to check dimensions before buying. No global availability has been announced yet — for now, 199 CNY in China only.
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