Widner's device is leaps and bounds ahead of the pack. well it seems to have 4 good tires..... https://investorshub.advfn.com/uimage/uploads/2017/11/4/xrhdfScreenshot_2017-11-04_at_5.10.08_PM.png Through my research, all other PAS devices are standard electronic-based only. I'm unaware of anything else on the market that even remotely close to this proprietary design. https://investorshub.advfn.com/uimage/uploads/2017/11/4/rw[nyScreenshot_2017-11-04_at_5.09.27_PM.png http://i0.wp.com/kevinobrienorthoblog.com/wp-content/uploads/2016/08/wild-west-snake-oil-salesmen1.jpg?resize=630%2C300