PowerTac E6 LED Flashlight CREE XM-L LED 600 Lumens, Firefly-low-high modes with Automatic memory function Firefly-low-high three modes, Automatic memory function, remember last used setting & will come on at same level as when turn off Press the push button halfway to momentarily activate the light Uses two CR123A or one rechargeable 18650 battery Can be weapon mounted or hand held with its standard 1-Inch body diameter