LaserMax Red Rail Laser, Fits Ruger SR22, SR9c, SR30c, Black Finish, Includes Battery LMS-RMSR
Specifications:

Wavelength	650 nm
Dot Size
Power	<5mW
Range
Weight	.6 oz
Battery	CR1/3N 3V Lithium (1)
Laser Color	Red
Firearm Fit	Ruger SR22/SR9c/SR40c
Reticle
Power Switch	Ambidextrous On/Off
Adjustments	Windage & Elevation
Finish	Black
Mount Type	Built-in Rail