this be the original workhorse flashlight that have be loop to my waistbelt since 1986 . it be slim , bright , and spot-focus accurately .  the issue I have with this product be :  a -rrb- bulb have a short average 2-3 month life span , b -rrb- the bulb 's metal tail contact require slight spreading prior to insert into the main body for flicker-free operation , and c -rrb- o-ring require frequent silicone spray for smooth one hand on\/off operation of the head .