Similar to the 2310 but in a Xenon version. The 3310 has a compact CNC-machined aluminum body with knurled pattern (for a secure grip) that's resistant to extreme temperatures. And the tactile response click tail switch turns it on for constant light or momentary blink. The M1 3310 LED comes with a free Cordura® holster with back-up battery pouch and 1 CR123 lithium cell. Packaged Weight: 7.2 oz.