This thing is annoyingly overpriced (mainly because you're paying for 100 feet of phone wire). It uses the same electronic circuit board as the Tristar device, but this version is much more expensive. I got stuck on the purchase because I wanted a remote display. It does a good job overall, the rubber buttons get stuck easily, but most of the time it just shows real-time solar output, the only time you have to fiddle with the buttons and menu trees is to check history (i.e. recent 30 days). registered solar power).