This is basically just bootstrap-switch (js + css), with
the addition of these three lines in the .js file:
<snip>
// SLX-Admin: Enable for class bs-switch
$.fn.bootstrapSwitch.defaults.size = 'mini';
$("input.bs-switch").bootstrapSwitch();
</snip>

This makes sure any checkboxes or radio buttons with the
class "bs-switch" will automatically be turned into
bootstrap switches.

To apply bootstrap-switch to your checkboxes you need to
a) give them the class bs-switch
b) either make bootstrap_switch a dependency of your module (config.json)
   or, as a "soft dependency", just call
   Module::isAvailable('boostrap_switch')
   somewhere in your code. If bootstrap_switch is not activated, your
   page will still load and show old fashioned checkboxes