I wanted a device to monitor temp in camper when my husband and i leave dogs. I purchased RVPet Safety monitor that alerts phone, email, text. Was a less expensive option. Can set up what works for you. You can pay for a month or yr. Since I am not full time I start for a month when we vacation and stop when we get home. This system is TERRiBLE due to poor instructions, ecah time I unplug i need to reset but there is no written instructions and takes forever fto get an answer from company.
So i than purchased the more expensive Marcell system. This monitor plugs into electric with battery back up, monitors temp, humidity and can be set with high and low parameters. Again i can pay for a month or a yr. I used it this month for a week and worked great, when i set it up on my home computer than moved to camper i received alert on my phone and was able to cancel alert, same as when i brought monitor from camper to home. The unit comes with written instructions.
Hope this helps.
deb