Our laser collimators have a 45 degree face on them so they extend out from the bottom of all but the longest focuser. This allows the collimator face to be easily viewed from the bottom of your scope when adjusting the collimation screws. 

The collimators take two AAA batteries (included).  Instructions, an Allen wrench (for adjusting the laser beam if you deem this to be necessary), a gummed paper ring for Newton primary mirror are also included with each unit. 

The laser is a class IIIA, 650 nm laser diode of less than 5 milli watts. It is considered safe for consumer use, but you should avoid letting the beam enter your eye, directly or after reflection from a mirror. It is OKAY to look at the scattered light from the red spots where the beam hits the mirrors.

There is a one year warranty for defects in materials and workmanship on the collimators.