The controller has an Atmega 328p microcontroller, with GRBL 1.1 pre-loaded, to interpret g-code
It can be connected with USB to Windows or OSX computers, and to the computer it looks like an Arduino nano. Arduino drivers work, as well as the “easel local” driver as developed by Inventables (that allows you to use it with the easy to use cloud software “easel“).
The button on the top is an emergency button: pressing it down will stop the power to the motors and it will remain in this pressed down position. Turning it slightly will allow to pop it up again – but it will not remember it’s last position where it got pressed down so you will have to home the machine again if the emergency button was pressed during an operation.
The three white buttons on the front are from left to right: