This light is amazingly bright for it’s compact size! It is powered by one AA battery. It has three brightness levels adjusted by tightening the head rapidly once for low, twice for medium and a third time for high. It is silent and small easily slipping into a pocket without a second thought! I purchased mine from countycomm for $29.00 + approx. $8.00 shipping and handling. I am extremely pleased with this powerful little light!