The ATPLS Tactical Red Laser Sight Mounts onto most Trigger Guards, perfect for Pistols that do not have an integrated Accessory Rail. Fully Adjustable for Windage and Elevation. Side to Side Toggle On/Off End Cap Switch. Plastic Construction. Uses 2 each AG13 button cell batteries (Included). Includes mounting tools. Dimensions: 2.7" L x 1.1" W x 0.7" H. Red Laser: Freq. 635-655nm, Class IIIa Laser. Maximum Output: <5mw.