DCF77 Time Module

Hello.

I'm very interested in the DCF77 Time Module and I have order one from PVElectronics, but I have some questions about its technical data:

Supply voltage range: Max 5V, Min 1.8.
What voltage are you using? 3.3 or 5v?

PON Input Level High: Min 0.85.
Is this enough to arduino? is some interface transistor needed?

Thank you very much.