I have a d4v2 that I love, along with several other lights that function perfectly fine. Do I need another light? Obviously not, but I wanted another light, so I justified it by arguing with myself that I needed a light with a backlit button. I reached out to Hank, asking him if he could set up a D4V2 with a backlit button. He could have replied in a number of ways: Absolutely not; yes, but it will cost you; or yes, tell me your order number.
Guess his reply and who has another d4v2 on the way.
Let me guess: Hank owns Emisar flashlights? 
He is a man of commerce, yes.
He figured out that If he sells good lights and offers good service, he make millions of dollars.
If that was true I’d also be making millions lol
Do any of the Emisar lights have waterproof Ipx8 or higher?
The answer you seek is but an email conversation away.