The AAA battery-operated LED Lenser i4 penlight is slim in design which is able to get into the smallest and tight places to provide you a light input of 120 lumens. Same as the Ledlenser i-series, the i4 is fitted with the patented Advanced Focus System which enables infinite and precise focusing of the light cone. The diamond knurling gives you a firm grip even with oily and slick fingers. With a glare-free advanced focus system, this light provides sensational power while being lightweight for EDC. A great choice for craftspersons, electricians and industrial workers.