Gboard is a mini keyboard specifically designed for GMail as a replacement for keyboard shortcuts. It contains 19 color coded keys in the size of numeric keypad and each key performs a particular keyboard shortcut. The keyboard can be used with other application as a normal keyboard.
The device is USB powered and required no drive (good for Linux users). You have to make sure that you have enabled keyboard shortcuts in your GMail settings to make it work. The price is also decent ($19.99).
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