Methods and systems for facilitating a subscription-based on-line property listing as part of an on-line property listing publication service are described. The vehicle has panels that provide a wind tunnel when the vehicle is in motion, and a wind generator which is positioned inside or outside the wind tunnel to supply electricity to the power pack while the vehicle is in motion. The dose dial sleeve may have a helical thread of first lead and the drive sleeve may have a helical groove of second lead.