Yup, amazed at how quick they turn on and off. My boot ones actually stop working by the time I get in becuase the boots are so well sealed, so I give them a few minutes to heat up before putting them in. I did order a set of these though:
https://www.amazon.ca/gp/product/B01...?ie=UTF8&psc=1
as I hate throwing stuff out like that. Will see how they work, if they ever arrive. Unusually slow for Amazon on this one...