Klein Tools. Rechargeable Light Array Headlamp with its unique LED pattern offers a more usable light field. You.ll know when it.s time to recharge the lamp, because the LED lights on the battery gauge clearly indicate how much battery you have left. Easily remove headlamp from the strap bracket and mount it directly to a Klein Hard Hat, or mount with the backside magnet to use as a work light. The adjustable, comfort fabric strap comes with a handy holder for your marker and carpenter.s pencil.