Hall-effect keyboard
https://en.wikipedia.org/wiki/Keyboard_technology
> They are used for ultra-high reliability applications,

XMIT Hall Effect Mechanical Keyboard - Massdrop
> These Hall switches are much smoother than Cherry MX Black and are comparable to Gaterons.
> The 70g weight is a little lighter than MX Black. The 50g is a little lighter than MX Red.

> Good news! It looks like we’ll have some sort of re-programming option
> available in a couple of weeks - after the drop ends but well before shipping.
> So, if you want to remap Ctrl, or Fn, or Caps Lock, or Esc or any other key,
> this is now possible!
 　
BBR-MD5:5d373e2f3ac7bca61f2a609fe6599be6(170)
BBS_COPIPE=Lv:0
PID: 33375
[0.094259 sec.]
Rock54ed.