Regulated: ego batteries are "regulated", as are the Advanced Personal Vaporizers (APV) like the Vamo, SVD, MVP and such. They don't all have to have a screen or controls other than the fire button. They do have a circuit of some type in them whether it's to keep it at a constant voltage, or to allow you to adjust the voltage or wattage yourself.
Unregulated: Most people think of Mechanical types (no wires or circuits) only, but there are many unregulated PV's out here, like the smoktech Bolt. You can have wires or electric buttons/switches, even LED's and volt meters on them, yet they have no circuits controlling the power to the atomizer. No wires or electronic switches = mechanical (and unregulated), Wires and electronic switches with no controls = unregulated.