Powerful violet laser pointers at 405nm~410nm, also named to purple lasers. The blue violet laser is handheld pen-sized. You can see they're different with the pure blue 473nm laser in the following video. The 473nm blue laser is the first blue laser in the world, and it's very expensive, as high as 400USD.  473nm blue laser. 

Wavelength:405nm 

Output power : 50mW 

Beam Divergence: <1.5mm 

Operating Lifetime: 3000-5000hrs 

Dimensions: 14mm X 155mm  

Batteries: Alkaline AAA x 2 PCS

Operating Current: 150mA 

Operating Voltage: 3V

Operating Temp. Range -10 ~ 70