How much Volts and mAh can I out into a 5 mW green laser

Hi all
I'm a newbie and got a new sky laser and I wanted to know how much is the max input for a 532nm 5mW green Laser. I want to know this because I put my laser to a positive and negative wire and that gave it 5V and it work amazing so I was wondering how much is the max V on this laser

Thanks