Can you control when they are emitted? If so, it would be handy when outside in the cold. Otherwise... no.
Do I have a hypno-ray?
Downside? What downside? That's awesome!
Kind of like Destroyman from No More Heroes.
Since it says the words "at will" (which means you control when it happens....) then yes.
Where should this comment appear?
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Whenever "Gain invulnerability and super-speed, allowing you to run anywhere in ..." appears
Whenever "Gain superpowers allowing you to emit highly visible and flashy ..." appears