ArmaLaser TR-Series Laser Sight fits H&K USP Full-Size. Does NOT fit the compact USP. Yes, the laser activates just by gripping your pistol. Without having to think about it, the TR will throw out the most powerful laser beam the law will allow as soon as you grasp your pistol, accurately and immediately. Using human touch, True Touch Technology, you’ll have a normal, natural feel without an awkward push button on the grip. Touch Sensor is located in the PERFECT spot. Right at the point where the trigger guard and pistol grip meet. Where your middle finger naturally rests. All TR models turn on by human touch, not by a mechanical switch or button. As soon as you grasp your pistol, the True-Touch Activation sensor will turn the laser on and keep it on as long as you’re grasping the grip. It is seamless and immediate and requires no button to be pushed or secondary operation. Move your middle finger forward and the laser will shut off. Patent 9,328,994 Additional Patents Pending. Available in both Green and Red! ArmaLaser only uses the 635nm wavelength in our red lasers. 635nm is up to 5 times brighter than standard 650nm lasers. For the highest visibility, green lasers can’t be beaten. ArmaLaser green lasers have the highest battery life of any concealed carry laser. Custom-Fit for your pistol model. Rock solid mounting made from same Dupont Zytel as pistol. Plenty of Holster Options. Choose from LASER-FIT Holsters from ArmaLaser / CROSSBREED / DeSantis, STICKY, LASERPRO & others. To be defective in either parts or labor. ArmaLaser manufactures the most advanced laser systems in the world. We concentrate one one thing: Turning a laser on as soon as you grasp your pistol. And giving you full control over burn time. You want it off? Move your middle finger forward a bit. Then move it back to burn laser again. ArmaLaser manufactures only 635nm lasers (closer to deep orange-red in spectrum) which are up to 5 times higher in perceived brightness than 650nm red lasers such as the LaserMax Centerfire, LaserLyte, and Crimson Trace Defender series. It’s a very noticeable difference side by side. The TR-Series’s brilliance, however, is on how the laser turns on. And this is where the TR-Series changes the direction of the firearm accessory. Only the ArmaLaser switching system has basically no thickness to it. And you turn it on without needing to do anything but grip your pistol. There is no bump under your middle finger to throw off fingers onto different levels. And no button to reach in a stressful, possibly disorienting situation. We feel a linear switch which runs for a certain length under the trigger guard is a better type of switch for the many different types of hands & grips that people have. The material we use in all our models is DuPont’s Zytel ST8018 glass-reinforced polymer which is what most pistol manufacturers use in the their grips/frames. So our lasers match up in the same material, finish, and color as the pistol. That’s why many people comment that our lasers look like a factory option. You can choose between pulsing or steady beams. Dot is fully adjustable for windage & elevation. A battery door means easier battery changes without laser disassembly. A master switch in recessed into the housing to allow practice without the laser turning on. Up to 6 hours of burn time from for a single CR1/3N lithium battery (can also use 2 357 watch batteries). Another advantage of touch activation over mechanical switches is that it’s not easy to turn on in a holster if something pushes against it. Rock solid mount, we do mounting as good as it gets. No gunsmithing, anyone can do it. HIGHEST QUALITY BEST DESIGNED LASER MADE TODAY. Your laser needs to be there for you, without you having to be there for it.