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40.5g, 320 Lumens: The Nitecore HM01 is a tactical helmet light that produces a high 320 lumen output with a max 74m beam distance. The HM01 is specially designed for ARC rails and features a 3D pivoting system for adjusting it to the desired angle. The HM01 has two output modes which can easily be controlled with the one button interface. This light runs off a disposable CR123A battery (included) and is also compatible with rechargeable RCR123A batteries (see related products for additional batteries). The HM01 is ultra compact and lightweight weighing only 40.5g which makes it perfect for mounting on your helmet. CR123A battery included.