Sunwayman G20C Compact Flashlight, w/CREE LED, 400 Lumens, w/1x18650 or 2xCR123 G20C-XML2-U2 CREE XM-L2 U2 LED, with a lifetime of up to 50,000 hours Tail cap dual-push-button switches, one to control on/off, the other for selecting desired output mode, three types mode-switching High (1000 lumens, 1 hr); Mid (150 lumens, 6 hrs ); Low (16 lumens, 80 hrs ); Strobe Uses one single 18650 or two CR123A batteries Effective range of 208 meters