need Help! 200mW Green Laser Module

Hi, i was thinking about buying a green 200mW laser module and I'm seeking help. I am new to lasers and if I buy this particular how will i attach a power supply to it? What type of battery is needed for the the module and do I need a host for it?

thank you



link to the laser
laserhttp://www.ebay.ca/itm/200mW-532nm-Solid-Green-Laser-Diode-Module-w-h-Heatsink-/260611008003?pt=LH_DefaultDomain_0&hash=item3cada0 6603#ht_3612wt_986

1) Do you know this seller? The seller is located in china, and unless you know for sure he delivers quality products then the laser will be underspec and far to expensive for what it's worth. Most china based sellers overrate their lasers a lot.
2) modules like this required a + on the case an a - on the spring.
3) You need a battery delivering the voltage stated in the specifications. To find a host use the search function, plenty of people here have posted that.