Got it after 9 days shipping. No boost for 18650. C6 switch is reverse clicky style; audible sound bf deployment. The lens focusing unit is in a unique nut shaped like a mini crenellated bezel. Spot is focusable and concentrated. Burns steady on 2xAW IMR16340s but needs an inner sleeve from 18650 to 16340. Love its straight form & compact size! Tks!