Other features include a  battery compartment easily accessible on the side of the Laserguard with a  lanyard that secures the battery door to the unit at all times. This facilitates  changing the battery without having to remove the unit from the gun, if  desired.
The LG-645 exceeds MIL-STANDARD specifications for waterproof, high and low  temperature operation.

Technical Specs
 ActivationFront-located integrated momentary pressure switchUser AdjustableBoth Windage and ElevationMaterialPolymer housing w/front overmold activation pressure padWarranty3 Years CompleteMaster On/Off SwitchNoBeam Intensity5mw peak, 633 nm, Class 3R laserDot SizeApproximately 0.5" diameter at 50 feetPower SourceOne 1/3N 3V lithiumFits ModelsFits Heckler & Koch HK45C pistols

CTC HKlg645

LG-645
 Lasergrip for H&K Compact 45
 Retail Value $239

LASERGUARD® FOR HECKLER & KOCH (HK) 45C
Specifically designed to fit securely around the trigger guard of the HK45C,  the LG-645 is a rugged, waterproof compact laser sighting device that is  instinctively activated by a rubber overmolded switch.

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for H&K
Compact 45

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