I use this for my coffee maker and only use 2 timers...one to turn on and one to turn off Monday through Friday. It happened several times that this device turned on the coffee maker at random times. For example at 2am for no reason. This is VERY DANGEROUS and may cause a fire. The first time this happened I did a hard reset and reconfiguration. It worked fine for a couple of weeks until it started working again...turned on at 2am. This is very serious and you should take care of it. I sent an email to the app developer and didn't get a response.