Using a dimmer, to dim the beam of a 520nm laser module

Hi,

I am about to buy this 10mw, 520nm laser module

10mW Green (520nm) Locking Focus Direct Diode Laser Module Dot, Line and Cross (16mm, 3-5V) - OdicForce

I was thinking to buy a dimmer like this

Dimmer Switch Cable for 5V Laser Modules with 5.5mm x 2.1mm Plug and Socket - OdicForce

1) Will the dimmer make the beam less bright, so I can control the brightness according to the level of ambient light pollution ( i will use the laser for astronomy in different areas more or less light pollutes)

2) Can the dimmer damage the module, changing the amount of electricity passing through?

3) Will the dimmer save some battery life?

Thanks

Giangi