Can the firefly device turn on by itself?

To turn on the firefly device requires the button to be pressed for around ½ second and released. This makes it unlikely that it can be turned on accidentally.

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How do I turn the Firefly on and off? Can I sleep with the Firefly device on? Is the Firefly device reusable/rechargeable? How long does the Firefly work? Is the Firefly device painful to use?