Koolertron One Handed Macro Mechanical Keyboard, Blue LED Backlit Portable Mini One-Handed Mechanical Gaming Keypad 23 Fully Programmable Keys Red Switches (Blue Backlit/Red switches)

I bought the keyboard with the red switches. Feels great to type on and the size is excellent for my use case. It is well-built.The important features for me were the programmability and the onboard memory. Every single key can be programmed to whatever key or key combination (eg alt+d, ctrl+x, etc.) with the software that you download from Koolertron. The software isn’t as straightforward as something from Razer or Logitech but since most people purchasing this product will be geeks to some degree it’s easy to learn how to use it after a few minutes.All of the key modifications are saved to the keyboard so you can plug it in to any pc and it will work. Additionally there are 4 programmable “layers” so that you can switch between 4 separate keyboard layouts.The software allows you to program macros but I didn’t bother with it, I use AutoHotKey which is unbeatable for macros.The RGB lighting is great too, I typically work in a dimly lit room.The only flaw was that it wobbled a bit after I attached the rubber feet to it. To resolve that problem I stuck a thin piece of rubber under the wobbly foot and it stabilized the keyboard.

Refers to Koolerton 23 Key keyboard (Blue Backlight / Red Switchs)this is really a mixed review. There's a lot to like here and this might be perfect for some applications. But in my case, there are a lot of down sides too.Lets start with the things I like1) Excellent build quality. Feels solid. Worked perfectly out of the box. A+ here.2) Very high quality USB cable came with it. Another A+3) There are 4 layers, so in reality you can map up to 96 different keys (23 x 4).4) Full set of Black keyboard keys with transparent letters, perfect for the backlit keys5) 23 extra blank white keys.6) Included keycap puller7) Actual usable instruction pamphlet included with it. Who does that these days! Very nice touch. Like it.8) Software worked well (on an up-to-date Win 10), no problems running it and connecting to the Keypad.9) Running the software on 2 PC is possible. When moving the keypad to the other PC, just connecting to the keypad will download the config from the keypad into the software for changes. No need to transfer config files from one PC to another.Now for the list of things I didn't like (or could use improvement):1) The software for programming the keyboard is a little quirky but nothing too difficult to figure out with just a little trial and error.2) Clicking the "Upload" to keypad button only uploads the section you're working on. ie. changing the keymapping upload will not upload the macros. You need to upload those separately. Just a quirk to learn3) Each key can be programmed with either a single keystroke or a macro. By single keystroke, I mean one key-press. If you want to do a combination keystroke, like Win+L, that's 2 keystrokes. Tp do that you need to use macros.4) You can assign a "Macro" to a key press. But you're limited to only 24 macros. For your macros, 12 of them are "Quick Macros" limited to 24 chars max. And 12 are "Custom Macros" which are limited to 42 chars. Remember, pressing Shift, Ctrl, Alt, or Win key modifiers consume one of your precious few characters.5) Remember, with the 4 layers, you really have 92 programmable keys but only 24 macros. That limits the usefulness of the keyboard as the remaining 69 keys will need to be single keys, same as on your normal keyboard.6) Given the limited size of each macro (24 or 42 chars) and only having 24 macros available, the usefulness is limited.7) Macros can contain other imbedded macros, so you could work-around the 24 or 42 char limit, but you'd be using more of your precious few macros.My intent was to store fairly long strings of frequently repeated keystrokes. This is just to limiting for that.Things for improvement:1) Increase the size limit on the macros to at least 100 chars.2) Increase the number of macros available. 92 sounds like a good number :)3) One missing feature that would be nice to have in the software is a Macro recorder. Would be nice to have it record my keystrokes as I work instead of making me enter a series of keystrokes manually.So there you have it. Its a well built solid product. But has a lot of drawbacks when it comes to taking full advantage of an otherwise excellent product.** Update 1 **I noticed a weird quirk. If Caps Lock is set ON on your main keyboard, the Caps Lock will also apply to any key or macro on this keypad as well. Kind of defeats the purpose, especially if you have passwords stored on this keypad.

Believe it or not but I still have a machine that runs Windows 7 because I love to use Windows Media Center as my DVR for cable TV. The one downside to WMC is that it has inconvenient keyboard shortcuts so you can't go zipping around the interface very easily when watching videos. However, with the Koolertron keypad, you can program those awkward shortcuts so they can be executed with a single keystroke. Note that I programmed the keypad using a Windows 10 machine but the keypad still works on a Windows 7 machine, so it is truly portable.I also use this for PowerDVD when watching Blu-Rays because it too requires multi-key shortcuts to do navigation.I also use alternate character sets when typing documents. Nothing slows my typing down more than having to hold the Alt key down followed by typing 4 digits on the keyboard numpad to get an "a" with particular accent marker, or an "n" with a tilda. Now that I have the Koolertron, I can program these characters so they can be executed with a single keystroke. What a timesaver!Just to clear up some confusion about the use of Layers on this keypad: this keypad does have 4 layers, meaning you can technically program 4 x 23 = 92 keys. However, since you need some keys to navigate between layers, you really only have 20 keys per layer. And lastly, one of the layers requires you to press an "FN" key along with another key to execute a command. So I never use that layer because my whole reason for buying this keypad was to avoid multi-key typing. So for me, I have 3 x 20 = 60 keys available for programming which is plenty considering you can only program 24 macros total.I do wish Koolertron would produce a new version that had more than 24 total macros. I would be willing to pay double for a keypad that had 48 total macros. I get around this current limitation by saving different configurations to .hex files (this is a great feature of this keypad) and loading the one with the macros I need for the task at hand. But it would be nicer not having to keep track of what macro was on what configuration file.