3-Key Mini Keypad Wireless Mechanical Gaming Keyboard Hot Key Customized Program with RGB Led

Really easy to program using the Elfkey app. I used the USB version. My application was to control a media player remotely in a stage performance. It worked perfectly! If you need pre-planned keyboard typing with one button, this is exactly what you need. Highly recommend.

This device is amazing, and deserves 5 stars. The customer support makes me want to give 10 stars! Unbelievably helpful.I bought this so my disabled daughter could control the media on her "Smart TV". The MK321BT was instantly recognized by her TV as a "keyboard", and she was able to control her media by "squeezing" the keys, but didn't have the coordination to "release" the keys. PCSensor support worked with me for 3 days (!) to come up with a solution that works FANTASTICALLY, and allows her to do just what we were hoping. Just amazing customer support.Also, yes, the lights can be turned off easily. Click the RGB icon in the bottom middle of the software, and select "turn off all lights" and the battery will last much longer.Anyway, I am super happy with this little device. Easily 5 stars!

I don’t usually leave negative reviews, but I’ve had a frustrating experience with this product. Despite fully charging it, the keys only work if I'm within a foot of the dongle on my Windows PC. I’ve set the buttons for basic functions like ESC, Space, and the number 1, but they still won’t respond unless I’m extremely close to the dongle. It just isn't reliable

This has replaced my other two Bluetooth page turners for use with my Boox Max Lumi.It was easy to program the keys for page forward/back and refresh using the downloaded Windows software. It connects automatically to my ereader and the connection is stable and reliable.One hint for those who are complaining that the battery life is very short - turn off all of the LEDs on the device, both under the keys and the connect light. This will greatly extend the battery life to weeks, not days.

So, like other reviewers have said, the battery life on this thing is not ideal. I only have it turned about for about 8 hours a day. Its only purpose is to mute the mic in Slack and Zoom. To do that without downloading the manufacturer's software, I'm using Karabiner-Elements (on macOS). I was hoping to be able to use Hammerspoon because I'd converted all of my Karabiner stuff over a while back, but I could not get a working solution.Anyway, with regards to the battery life, it appears to have drained 75% after being turned on for about 12 hours. On the flip side, it's charged back over 70% in about 10 minutes.Feature-wise, it's three buttons. They send 'a' 'b' and 'c', respectively. It also apparently has "layers," but the label on the bottom and what actually happens on the device don't exactly match up for me; all of the layers send the same keycodes. The color under the keys is actually an LED "backlight." I'm looking for a way to turn that off (again, without the manufacturer's software) because that's surely draining the battery more than usage.All said, worth the money and effort for me. If you're not a techie or a programmer, you'll likely be stuck with the manufacturer's software. Again, haven't tried it and won't. It's gonna be Chinese and I just don't want that on my computer.

I wanted to use this to allow people to interact with a display I have. Unfortunately, it seems you have to reconnect it when you haven't used it in a while, so it is useless in that context. The only way I have been able to make it reconnect after it disconnects is to unplug the dongle, press/hold the connect button, and plug the dongle back in. This is fine in a context where you are using it actively at your desk, but not in an environment when people will occasionally press it.

Super nice USB-A to USB-C cable. Keyboard has a great solid feel. Software easy to use once you get past the non-intuitive parts. Be aware that the keyboard must be connected directly to the PC for programming - it can't be connected through a USB hub. After programming, the keyboard works anywhere through any number of USB hubs.

What should be a simple and easy to use device, is pretty terrible. The pointer to the software pointed to a site that was down. I searched, and found another source, but that software did not work on my Mac. After a lot of searching I did finally find some software that supported M1/M2 chips used in the new Macs, but that was just the beginning!After finally getting the buttons programmed, I found that in bluetooth mode, the battery barely lasted 48 hours! The device has colored LED's that are always flashing (using up the battery), but providing no useful function that I was able to determine. Even when used in wired mode it's a little flaky and unreliable. If I reboot my machine it seems to take almost 5 minutes before the device will start working again.Let me also say that I am an advanced user, so the fact that I spent over 2 hours trying to make it work says to me the the average "Joe" would not be making a wise decision to buy this device.