I bought one 2nd hand from ebay. No way I could afford new. Have had a couple of shots of it, so not expecting to see massive results yet.
It makes a noise (fan) when it is on, charges up, little red light comes on if it is against your skin and it clicks when you press it.
But would you expect to see the flash? Does some of the light normally leak out as it were or does the fact it is against your skin stop it? Don't want to sit there like a numpty clicking away if it is not lighting up.