For some reason, people on this forum dont seem to rate them, but I have used two WHALE products and found them excellent.
I have used the supersub with integrated electronic switch
and found that reliable.
I have also used a whale standalone electronic switch to control a pump to get rid of rainwater on the deck and that worked marvellously.
I was concerned about the drain from the electronics on standby, so I measured it, it was in microamps and would take months to have any effect on the battery.
No, I don't work for whale.