24kupi Invisible Watch Review — Can Teachers Actually See It?
The 24kupi Invisible Watch is their budget option at $70. The name is misleading — it's not invisible. It's a small device with a tiny screen that you wear on your wrist under your sleeve, designed to display pre-loaded text notes during exams. I bought one and wore it to two exams. Here's whether it lives up to the name.
What It Actually Looks Like
The "Invisible Watch" is not a watch at all. It's a small rectangular device about the size of a USB flash drive, with a tiny OLED screen (roughly 0.9 inches). It has a silicone strap that wraps around your wrist. There's no clock face, no watch hands — nothing that makes it look like a normal watch. It looks like what it is: a small electronic device strapped to your wrist.
The "invisible" part relies entirely on your sleeve covering it. If you're wearing a long-sleeved shirt or hoodie, the device sits under the fabric and the screen faces your inner wrist. You peek at it by slightly pulling back your sleeve.
Screen and Text Quality
The OLED screen is tiny but surprisingly sharp. White text on a black background is easy to read in normal lighting. You can fit about 4-5 lines of text at a comfortable font size. Scrolling is done with two small buttons on the side of the device.
Loading notes works the same as the calculator — connect via the included 3.5mm USB cable, drag and drop text files. Storage is more than enough for any exam.
The "Invisible" Claim — Is It True?
In my first exam, I wore it under a dark hoodie sleeve. Nobody noticed. The room had about 40 students and two proctors walking around. I checked it maybe 8-10 times during the 2-hour exam by casually pulling my sleeve back as if checking the time.
In my second exam, I wore it under a thinner long-sleeve shirt. The proctor walked past me and I instinctively pulled my arm under the desk. She didn't notice anything, but I was paranoid the entire time. The bulge under a thin sleeve is noticeable if someone looks closely.
The Real Problem: Teachers Know
Here's the thing 24kupi doesn't mention: cheating watches have been around since 2010. Teachers know about them. Many universities now have explicit rules about wrist devices during exams. Some proctors ask students to roll up their sleeves before the exam starts. Some ban watches entirely.
The "Invisible Watch" was clever in 2015. In 2026, it's a known quantity. If your school has any awareness of cheating technology, wearing something on your wrist is the first thing they check.
Battery and Durability
Battery lasts about 3 hours of screen-on time. Charges via the 3.5mm cable (not standard USB-C, so don't lose the cable). Build quality feels cheap — the plastic body flexes if you press on it, and the strap isn't very comfortable for extended wear.
Compared to the Easy Study Watch V2 ($55)
24kupi also sells the Easy Study Watch V2, which is $15 cheaper. From what I can tell, the main difference is the screen size (slightly smaller on V2) and the storage capacity. Both have the same basic functionality — text display under your sleeve. Unless you need the larger screen, the V2 is probably the better value.
Pros
- Cheap at $70
- Sharp OLED screen despite small size
- No partner needed — self-contained
- Simple to load and use
- Works if your school doesn't check wrists
Cons
- Not actually invisible — visible under thin sleeves
- Teachers in 2026 know about cheating watches
- Many schools now ban wrist devices during exams
- Tiny screen — only 4-5 lines visible at a time
- Non-standard charging cable
- Cheap build quality
- Can only display pre-loaded notes (no internet, no AI)
Final Verdict: 4/10
The Invisible Watch was a good idea a decade ago. In 2026, wrist-based cheating devices are the first thing proctors look for. The screen is sharp and the price is low, but the detection risk is high and the functionality is limited to pre-loaded text. If your school doesn't check wrists and you have long sleeves, it works. But that's a big "if" in 2026.