You can only hook the Reedy warmers up to a 7.2v pack or they burn holes in them
- so no power supply which is a bummer. They're also not adjustable either.
The best warmers out right now would have to be the Much More ones, they are expensive but work so well and are so adjustable that it's definetly worth it for asphalt racing.
The Yokomo digital warmers are nice too, but they cost even more than the MuchMore warmers.
I dont like the digital Trinity warmers because the tire cups do not have a stiff plastic insert like the MuchMore ones so they're not as nice to use. That and the fabric inside can absorb traction compound if it soaks through the towel.