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If you’ve been eyeing ProtoArc’s thumb-operated trackball mice, you’ve probably noticed two models sitting side by side in search results: the original EM01 and the newer EM01 NL. The naming is confusing — ProtoArc doesn’t exactly shout about what changed — and the price gap between the two can leave buyers wondering whether the “NL” revision is a meaningful upgrade or just a cosmetic refresh. In this comparison, we break down the published specs, manufacturer claims, and verified customer feedback for both models so you can make a confident decision. We also look at the Anker Vertical Ergonomic Mouse as a popular alternative for anyone who wants ergonomic relief but isn’t sold on the trackball form factor.
Best for: Remote workers, designers, and anyone battling wrist strain from traditional mice
Why Trackball Mice? A Quick Primer
Before diving into the comparison, it’s worth understanding why trackball mice have surged in popularity. Unlike a traditional mouse, a trackball keeps your hand stationary while your thumb rolls a ball to move the cursor. This eliminates the repetitive wrist-sweeping motion that contributes to RSI (repetitive strain injury) and carpal tunnel symptoms. Trackballs also require zero desk space for movement — a huge plus for cramped workstations or standing desks.
ProtoArc entered this space as a budget-friendly alternative to the dominant Logitech Ergo series, and the EM01 quickly gained a following for delivering solid trackball ergonomics without the premium price tag. The EM01 NL is the company’s iterative update, and the differences — while not revolutionary — address several of the original’s most common complaints.
If you enjoy “is the upgrade worth it?” comparisons, you might also find our Nothing Ear (a) vs Nothing Ear (2) breakdown useful — it follows a similar spec-by-spec format for audio gear.
Key Differences: EM01 NL vs. EM01
Here’s what the spec sheets and manufacturer documentation tell us about the changes:
Sensor and DPI
The EM01 NL reportedly features an upgraded optical sensor with smoother tracking at higher DPI settings. Both models offer adjustable DPI (typically 400/800/1200/1600), but verified reviewers consistently note that the NL version feels more precise at the upper range, with less jitter during fine cursor movements — a meaningful improvement for photo editing or CAD work.
Click Mechanism
One of the most frequently cited upgrades is quieter click switches on the EM01 NL. The original EM01 used standard mechanical micro-switches that produced an audible click. The NL revision uses dampened switches that significantly reduce noise, which matters in shared offices or late-night work sessions.
Build and Ergonomics
The overall shape is nearly identical, but the EM01 NL features a slightly textured thumb rest area and refined button placement. Several reviewers mention that the scroll wheel on the NL model has a more defined detent feel compared to the original’s somewhat loose scroll.
Connectivity
Both models support Bluetooth and 2.4 GHz wireless via a USB dongle. The EM01 NL adds multi-device Bluetooth pairing (typically up to three devices), allowing you to switch between a laptop, tablet, and desktop with a button press — a feature the original EM01 lacked or implemented less smoothly.
Battery
Both are rechargeable via USB-C. Battery life claims are similar (roughly 2–3 months of typical use on a single charge), though some reviewers report marginally better standby efficiency on the NL.
ProtoArc EM01 NL Wireless Trackball Mouse — Detailed Review
The ProtoArc EM01 NL is the company’s refined take on its popular thumb-operated trackball. It connects via Bluetooth (multi-device) and 2.4 GHz wireless, giving you flexibility across different machines without swapping dongles. The ergonomic tilt angle — roughly 20–25 degrees — keeps your forearm in a more natural position than a flat mouse, and the thumb-operated 34 mm trackball provides smooth, desk-free cursor control.
Based on aggregated customer feedback, the EM01 NL earns consistent praise for its quiet clicks, comfortable thumb rest, and reliable Bluetooth switching. Users transitioning from traditional mice report a learning curve of a few days to a week, but most say the ergonomic payoff is significant once muscle memory kicks in. The rechargeable battery and USB-C charging are appreciated conveniences.
On the downside, some reviewers note that the trackball can accumulate dust and lint inside the socket, requiring periodic removal and cleaning (a common trackball maintenance issue, not unique to ProtoArc). A few users with very large hands find the mouse slightly small, and the DPI adjustment button placement can lead to accidental presses during intense work sessions. The included USB dongle is also quite small and easy to misplace.
Who should buy it: The EM01 NL is ideal for remote workers, programmers, and creative professionals who spend long hours at a computer and want ergonomic relief without paying flagship prices. It’s also a strong pick for multi-device users who need seamless Bluetooth switching. If you already own the original EM01 and your main complaints were noisy clicks or single-device Bluetooth, the NL addresses both.
Anker 2.4G Wireless Vertical Ergonomic Mouse — Detailed Review
The Anker Vertical Ergonomic Mouse takes a different approach to wrist comfort. Instead of a trackball, it uses a traditional optical sensor on the bottom but orients your hand in a “handshake” position at roughly 57 degrees. This vertical grip reduces pronation — the inward twisting of the forearm that causes strain with flat mice. It connects via a 2.4 GHz USB nano receiver (no Bluetooth) and offers three DPI settings: 800, 1200, and 1600.
Verified reviewers overwhelmingly praise the Anker vertical mouse for its exceptional value, immediate comfort, and plug-and-play simplicity. Many users report noticeable wrist pain reduction within the first week. The five-button layout (including forward/back thumb buttons) is intuitive for web browsing and productivity. Battery life from two AAA batteries is reported to last several months.
The most common complaints center on the lack of Bluetooth (2.4 GHz dongle only), the non-rechargeable battery design (AAA batteries instead of built-in lithium), and the fact that it still requires desk space for movement — unlike a trackball. Some users also note that the glossy plastic finish can feel slippery during extended sessions, and the 1600 DPI ceiling may feel limiting for high-resolution multi-monitor setups.
Who should buy it: The Anker vertical mouse is perfect for budget-conscious buyers who want ergonomic improvement but aren’t ready to commit to the trackball learning curve. It’s a great entry point for anyone experiencing wrist discomfort, and its familiar “move the mouse” operation means zero adjustment period. However, if you need Bluetooth, multi-device pairing, or a trackball’s desk-space savings, the ProtoArc EM01 NL is the better fit.
For another “is the upgrade worth it?” comparison in a completely different product category, check out our TheraGun Relief generational comparison.
Head-to-Head: EM01 NL vs. Anker Vertical Mouse
These two mice solve the same problem — wrist strain — through fundamentally different mechanisms. Here’s how they stack up on the factors that matter most:
Ergonomic Approach
The EM01 NL uses a thumb trackball with a moderate tilt, keeping your hand mostly stationary. The Anker uses a vertical grip with traditional optical tracking, requiring you to move the entire mouse. Both reduce pronation, but the trackball eliminates wrist-sweeping entirely.
Connectivity
The EM01 NL wins here with Bluetooth multi-device pairing plus 2.4 GHz. The Anker is limited to 2.4 GHz dongle only, which means it occupies a USB port and can’t pair with tablets or phones.
Precision
For general productivity, both are adequate. For creative work requiring fine cursor control, the EM01 NL’s trackball offers pixel-level precision once you’re accustomed to it. The Anker’s 1600 DPI max is sufficient for most tasks but may feel sluggish on 4K displays.
Learning Curve
The Anker has virtually no learning curve — it works like any mouse, just tilted. The EM01 NL requires 3–7 days of adjustment as your thumb learns to handle cursor duties. This is the single biggest factor for many buyers.
Desk Space
Trackball wins decisively. The EM01 NL sits in one spot. The Anker needs a mouse pad or smooth surface and room to glide.
Battery
The EM01 NL uses a rechargeable lithium battery with USB-C. The Anker runs on 2x AAA batteries (not rechargeable). For environmental and convenience reasons, the EM01 NL has the edge.
So, Is the EM01 NL Upgrade Worth It?
If you’re choosing between the original EM01 and the EM01 NL as a first-time buyer, the NL is the clear pick. The quieter switches, improved sensor precision, and better multi-device Bluetooth support address the original’s most common pain points. The price difference is typically modest enough that there’s little reason to opt for the older model.
If you already own the original EM01 and it’s working well for you, the upgrade is harder to justify. The ergonomic shape is essentially the same, and the sensor improvement — while real — is incremental rather than transformative. The strongest reason to upgrade would be if you need reliable multi-device Bluetooth switching or if the original’s click noise bothers you.
And if you’re not sure about trackballs at all, the Anker Vertical Mouse is a low-risk way to test ergonomic mousing without the trackball learning curve. Many users start with a vertical mouse and later graduate to a trackball once they’re convinced of the ergonomic benefits.
Similar to how the Sonos Roam 2 refined its predecessor with iterative improvements rather than a ground-up redesign, the EM01 NL is an evolution — not a revolution. But for new buyers, it’s the version to get.
Product Comparison Grid
Frequently Asked Questions
Can I use the ProtoArc EM01 NL with an iPad or Android tablet?
Yes. The EM01 NL supports Bluetooth connectivity, which works with iPadOS and most Android tablets that support Bluetooth mice. You can pair it alongside your laptop and desktop using the multi-device switching feature.
How often do I need to clean the trackball?
Most trackball users report cleaning the ball and socket every 1–2 weeks for optimal performance. It takes about 30 seconds — pop the ball out, wipe the contact points, and snap it back in.
Is the Anker vertical mouse compatible with Mac?
Yes. The Anker vertical mouse is plug-and-play via its 2.4 GHz USB receiver and works with macOS. However, the forward/back thumb buttons may require third-party software to customize on Mac.
Does the EM01 NL work while charging?
According to ProtoArc’s documentation, yes — you can use the mouse while it charges via USB-C, effectively turning it into a wired mouse temporarily.
How We Research
We have not personally tested, owned, or handled the products in this article. Our comparison is based on a thorough synthesis of manufacturer-published specifications, official product documentation, and patterns found across hundreds of verified customer reviews and expert analyses from established tech publications. We cross-reference claims from multiple sources to ensure accuracy and flag areas where reviewer consensus is mixed. This honest, research-driven approach lets us provide comprehensive buying guidance without fabricating hands-on experience.
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