u/Ok-Order-8283

Hey all, so I am thinking of buying this device :
https://www.amazon.in/Flashlight-nanometers-Lightweight-Pocket-Sized-Eagle670/dp/B09W7STXQJ
Its Eagle670 and apparently the wavelength it offers it 670nm and this particularly benefits the retina.
There are many other pricier ones in the market but Iam holding back cuz there might be cheaper versions available that give almost the same benefit but aren't aggressively marketed.
So, could the product be legit, anyone used it? Would appreciate any help here.
Thankyou.