Defender Series by Crimson Trace Springfield Armory XD/XDm-Accu-Guard Defender series Black DS-123. This Laser Sight is proudly made in specialized factories and constructed from polymer and nylon so you know that you are getting long-lasting quality. The Crimson Trace Defender Series Accu Guard Red Dot Sight uses just two .357 silver oxide batteries which are provided for you or one 1/3N lithium battery and lasts about two hours with a five-year shelf life. With a red beam intensity of 5mW peak 620-670nm and a dot size of about .5 inches at 50 feet you are sure to improve your aim shoot straight and hit your target with the Crimson Trace Defender Series Accu-Guard Laser Weapon Sight. This Red Laser Sight from Defender Series features micro-electronic components that are designed by a skilled team of award-winning engineers. The N-Gage activation provides on this Defender Laser Gun Sight a large easy-to-find bright red activation button; simply press the button before "N-Gage-ing" the target to activate the laser. The Crimson Trace Defender Series Accu-Guard Laser Sight is pre-sighted in at the factory at 50 feet and can be easily adjusted using the provided wrench. Specifications for Crimson Trace Defender Series Accu-Guard Springfield Armory DX(M) Red Dot Sight: Battery Life: (2) CR357 silver oxide batteries supplied with laser accessory pack. (1) CR1/3N can be used; both power sources maintain 2 hours of laser illumination Dot Size: .5 in at 50 ft Allen Wrench: .05 in Features of Crimson Trace Defender Series Accu-Guard Laser Sight: Red Aiming Laser Beam Lock Adjustments N-Gage Activation Seamless Fit Clam Shell Design Locks to Frame/Trigger Guard Polymer Nylon Fits XD 3" 4" 5"; XDM 5.1" 4.8" 3.8"; Does not fit the XD with out rail slot or the HS 2000 Diode Cover Diode Aperture Fastener Boss Sighting Channel On/Off Switch Battery Retention Pad Frame Retention Groove Diode Cover Diode Aperture Fastener Boss Sighting Channel On/Off Switch Battery Retention Pad Frame Retention Groove Package Contents: Defender Series by Crimson Trace Springfield Armory XD/XDm-Accu-Guard Laser Sight XD XD(M) Does NOT fit Tactical 5" & Service 4" with single rail notch What firearm models does the manufacturer say Defender Series by Crimson Trace Springfield Armory XD/XDm-Accu-Guard Laser Sight is compatible with? The manufacturer suggests that Defender Series by Crimson Trace Springfield Armory XD/XDm-Accu-Guard Laser Sight is compatible with Springfield Armory XD Springfield Armory XD-MDefender Series by Crimson Trace DS-123: Springfield Armory XD/XDm-Accu-Guard Defender series Black