Squonking is officially taking the world by storm. Squonk mods have been around for some time but have only recently hit the mainstream. A squonker is a special type of mod with a built-in bottle containing eliquid. It allows you to pump e-juice into your wicks and coils on demand. They are also known as bottom-fed devices because the liquid is fed upwards through the bottom of the atomizer.
A mech mod or a mechanical mod is an unregulated device without any circuit board and runs directly off a vape battery. Since there is no circuitry, and the batteries keep providing continuous power, vapor production reduces as the batteries near the end of their lifespan.