Exact(3)
One on the side acts like a modifier key for tap or drawing actions.
While I don't mind the use of a modifier key to make them happen (cuts down on clutter), the way it's set up is inconvenient for your hands.
The Razer logo in the middle can actually be used as a modifier key for changing things up about the keyboard.
Similar(57)
Having a few modifier keys and automatic tasks assigned to your feet on a simple, plug and play device like this could really help some people out.
Note that the Alt key is generally known as the Modifier key or more specifically Mod1.
Specifically note the "modifier key" which is usually Alt and described as Mod1.
It's like the one on a BlackBerry, except that this one even has arrow keys, modifier keys (like Ctrl and Alt), and a separate number pad.
There might be a problem when you try and use the modifier keys to use things like arrow keys, or the function keys – it could become counter-productive.
If your mouse features a scroll wheel, you can hold down the modifier keys and scroll.
Enable temporary zoom: holding down Control-option keys will pop up a zoomed window that is active as long as you hold down the modifier keys.
It does this by having not only a few dedicated macro keys on the far left, but by having a full seven keys below the space bar dedicated to imitating such combinations of modifier keys as "Shift+Alt," "Alt-Control," just plain "Control," and so on.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com