I got one of those two way alarms, comes with lcd fobs. Supposed to give info up to 100m,but was more like 5m,so tossed it.
The best is the simplest, and now disk lock with alarm is my recommended solution, as no battery drain as a bonus.
Plus my scoot, XC500 weighs so much, it does not get touched by those with evil intent.
I just see folks admiring it on occasion.