Is there any minimum limited on investment?

Pre-Sale:

Pre-Sale PHOTON token Hard Cap: 10,000,000 PHT

Currency accepted: ETH, BTC, LTC
#Token exchange rate: 1 PHT = 0.000102 ETH (accordingly in other cryptocurrencies, discount of 40% on the standard PHT price ).

Amount of tokens per one person: unlimited

Minimum transaction amount in Ethereum: 0.1 ETH
Maximum transaction amount in Ethereum: unlimited (within Hard Cap)

Minimum transaction amount in Bitcoin: 0.003 BTC
Maximum transaction amount: unlimited (within Hard Cap)

Start date: COMPLETED HARD CAP REACHED
End date: COMPLETED HARD CAP REACHED

What exchange you going to be listed?

Usually, a month or two after the ICO, the token is added to the exchange. I think it's too early to talk about this and the final list of exchanges may change.