The link I posted to the switchbox I own has two outputs that are fired through a text message. I can start a battery tender or my Tanis engine system. On a day I am flying, I text it when I wake up. By the time I have breakfast and drive over to the airport it is ready to go. I don't leave my battery tender on constantly but I will run it from time to time for a few hours.

I understand going cheap but I didn't see much difference when it's all said and done and I have a reliable unit with a remote antenna option to get a good signal outside the hanger walls. Besides, my doesn't look like it was assembled by a terrorist