I have recently received a shipment of Olight M20-s flashlights with the XPG-S2 emitter. A customer requested this light so I bought a few of them. This is a very nice light with dual o-rings front and rear, a side switch on the tailcap for instant strobe from off or to change modes when turned on, and a stainless steel crenelated bezel. The output and runtimes are very good as well. High is 340 lumens for 4 hours, medium is 115 lumens for 12 hours, low is 5 lumens for 600 hours on one 18650 battery. You may notice in the pictures that MAX lumens is 320 lumens. That is for the XPG-R5 led. The S2 led is 7% brighter. It also runs on two cr123 batteries as well. The only negative I have so far is that the included battery holder for the cr123 batteries won’t fit 4Sevens batteries. Two other brands I have lying around fit just fine. The Olight M20-S comes in a plastic case and includes a VERY nice holster, lanyard, cr123 battery holder, smooth ring, instructions, extra o-rings and a GITD switch boot. This would make a great self-defense light! I am selling this light for $97.95 which includes 4 cr123 or 1-18650 battery and free shipping in the US. If you need a 3.7V li-ion charger for the 18650 battery, they are $12 when bought with a light.