There are three upside down versions! All versions make the electrical connection to Ground via the mount. Two versions with switch are available, polished finish and black anodized. These are the most popular versions and have an On/Off switch, 140cm wire to the hub, and taillight connections. A third version has no switch or taillight connections. It's intended for custom bikes with a switch provided by the frame builder. This version is black with 149cm wire, switch and taillight connections. Unlike the regular Edelux II headlights, there is no Senso function on any upside down version. See Peter White's website for installation details: https://www.peterwhitecycles.com/sch-hl.php#EIIU