Tp40 , our company own design , Dual switches design , offers a fast access to momentary-on function and strobe mode High efficiency constant current circuit , constant brightnessreverse polarity protection , to protect from improper battery installation Intelligent memory function Specifications Led model : cree xm-l2 Battery options:1*18650 /2 * 16340/cr123a Size : 145mm*25.4mm*34mm Weight :128g (excluding battery ) Ipx-8, rock-resistant 1meter , intensity 12500cd, beam distance 223 meter , 5 function (high , middle , low, strobe , sos) 145mm*25.4mm*34mm 128g excluding battery