Review on Enhanced Search-Optimized Virtual Keyboard: Aideepen Beetle Module for Arduino Leonardo R3 with BadUSB Atmega32U4-AU Microcontroller Development Expansion Board by Chris Pacino

This device was immediately usable as a Leonardo (Pro Micro) Arduino. I like that it plugs directly into a standard USB port without an extra cable. Very low profile, does not interfere with other nearby USB devices. I use mine as a simple mouse emulator to prevent overzealous screensavers from kicking in and disconnecting me from my work (I switch laptops a lot and sometimes my screensaver settings get stuck.) It goes with my travel bag. Ideal for preventing sleep during a presentation. Haven't tested it much yet, but so far so good. Other observations: Depending on the thickness of your laptop, consider mounting the headers from the top rather than from the bottom as shown in the product image. With a thin laptop, you can end up scratching your desk. Putting headings at the top makes captions harder to read, but not impossible. (This is actually the best layout given the space available.) There are two (very bright) red LEDs. One appears to be powered and the other can be software controlled via pin 13. (For my application, I flash an LED to alert the user to an impending mouse shake.)