The GL4 Pro is powered by a replaceable and easy-to-find CR123A battery, and is also compatible with rechargeable lithium-ion 16340 batteries. It is waterproof to IPX8 and suitable for a variety of harsh environments. The toggle switch provides a clearer gear selection, tapping forward can trigger momentary on, and toggling up and down to turn on constant light mode. The wider tool-free latch design allows for quick installation and removal, can adapt to more rails, and the hidden indicator shows when the infrared light source is in use. It has four independent light sources, including white light, infrared illuminator, green laser, and infrared laser, which can be used separately or in combination. Zeroing can move both lasers at the same time because they are on the same module, and they will be at the same point at a distance of 27 meters.