Yes, Karoo comes with a tidy little light sensor that tucks into the top of our screen. We are able to detect ambient light conditions and auto-adjust backlighting for maximum battery life savings. We have also included an optional night mode.
March, 2017: At present we suggest using a fixed, low brightness setting for optimal battery life. That way the auto-dimming won't dial way up in really bright environments. We are working on an improvement to this.