

Left is always supposed to be off. If not, the UI/UZ designer who made the page messed up.
What I mean by immediate effect is that a switch is supposed to toggle something instantly. Checkboxes are more common in forms, where you expect to submit your choices later.
Switches with more than one option are generally bad, agreed with you there.
So far no radiation was detected, so perhaps it was stored more securely (or somewhere else).