One more thing, decades ago I used a device called a "recycling intervalometer" - actual use was intended for a photographer's darkroom - found here:https://www.amazon.com/Gralab-451-Timer-Intervalometer-115/dp/B003KP9THM/ref=sr_1_1?ie=UTF8&qid=1469569106&sr=8-1&keywords=recycling+intervalometer
This will switch the outlet in the back on, off and back on and off again and again. It can be set for minutes, seconds or tenth's of a second. So if one has a device to plug into a wall socket you then plug it into this timer and set it for so many seconds (or minutes) "on" and then for so many seconds (or minutes) "off" and it will repeat until you either are free, someone else turns it off, or the power fails.
I did fine whatever one plugs into this timer needs to pull a bit of power through it for it to function so I ended up plugging in a multiple outlet adapter to run my device and a 75watt lamp. The lamp helped and would flash on lighting up every time I felt the voltage hit me.
For the curious, I used a 0 to 12 volt AC to DC transformer at a very low milliamp rating. wired to a bipolar buttplug with a hot wire going to a penis electrode. There are better alternatives these day to play safe !
One caveat though, it can be rather pricy when new, so e-bay is your friend.