The Smart flashing hardly consumes energy despite the strong luminosity. 3 months I drive now already regular 1-2 hours in the evening and the luminance has only slightly diminished. (And the first pair of AAA batteries, the delivery includes) The assembly focused on the mounting ring is simple and is done in a few minutes. An attaching and removing the lamp is done by a steady clip in seconds. An excellent product that me now the fourth lamp (I ordered) totally thrilled.