No gimmicks, no weird apps, just charge and function. Which is amazing. What's more amazing is how easy to use and simple the device is, so simple in fact, I had a surprisingly difficult time finding something exactly like this, with a million and one devices that look like this, but full of gimmicks that may or may not require some weird app to set up or access special functions. The only other non-gimmicky function it could have is ability to tell time, which another user mentioned as well, but if I wanted a watch, I would have bought a watch, but I didn't want a watch, I typically have my phone for that, but not all the time, which leads into my next paragraph.
My main goal was to find something that could be on me at all time that would create a subtle reminder, which in this case, as a dream totem, something to remind me to check if I'm dreaming, to lucid dream, something I've been trying to do for the better part of 15 years, but still can't do it out of will, and nothing has worked yet, and I've tried everything. The ones I do have happen at random with no real pattern to associate. I've tried using my phone for this, but apps on the play store (to keep it short) either half work or don't work. I've tried setting alarms with the built in clock, and having to acknowledge the alarms every hour got super annoying super fast, and became inconvenient after a while, as sometimes I'd have to go to the other room where it was charging, and disable so i could sleep, defeating the point.
I was about ready to buy a tiny micro controller, a motor, battery, 3D print a case, strap, learn to code, etc. to make something that would perform exactly what this thing does right here, and look janky while doing it. Suffice to say that I am so happy I found it, as it works and functions better than anything I probably could have made myself, and looks good doing it. I have it set to go off every 15 minutes, and the vibration strength is enough to be notable, but not so much that it tingles or is audible, unless you're in a totally silent room. The AC is enough to drown out the sound of the vibration. The vibration may bother people who are more sensitive or hyper sensitive to touch and vibration. I do roll on the more sensitive side, but it's not anything that explicitly bothers me
Something I would like to see in a possible V2 of this is actually vibration strength setting, which would sit just past intervals, with a low [1], medium [2], high [3]. This could help save battery also if kept on medium or low. Another thing is vibration duration, something I thought I would have had an issue with. I thought it was a continuous vibration for 4.5 seconds, but it's actually a pulse. It personally isn't too much an issue for me, but may be for others. A shorter duration is something that could also save on battery life. I'm sure something like that was considered, but they opted for simplicity, something I actually do like a bit better. But if nothing more, vibration strength is something I would love to see.
One final thought, if there is to be a V2, or maybe just a slightly larger version to accommodate a slightly larger battery would be great also. The thin profile is amazing, but a tad wider wouldn't hurt either. I've only received it today, so life between charges is something I'll be testing. Durability too, as I'll be wearing this during sleep to hopefully induce lucid dreams.
Other note. It's not mentioned in the manual thingy, but pressing the bottom button will tell you minutes until next trigger, which I thought was neat.