Wavelength isn't very important but something around 445-555nm is easily absorbed, accessible and pretty. Strength is way more important. Something well made, focused and above 2000mW like this should never be pointed at a camera.
It could also easily and INSTANTLY damage eyes PERMANENTLY, even the reflections. It should be treated with the same respect as a firearm.
The pair of OD6 goggles that can be bought together with the laser pointer would make reflections safer, but a direct hit in the eyes would still not be safe.