Levers are switches, one state is on, the other is off. They have an infinite source of redstone power, somehow. This mod adds colored levers.
Birch Lever
Spruce Lever
Jungle Lever
Acacia Lever
Dark Oak Lever
Willow Lever
Ebony Lever
Silkwood Lever
Gelid Lever
Cobblestone + Birch Stick or Spruce Stick or Jungle Stick or Acacia Stick or Dark Oak Stick or Willow Stick or Ebony Stick or Silkwood Stick or Gelid Stick
For infinite redstone power, like if you need to power lights, or a redstone contraption and you need a long power source to be on. It has an on and off state, like a button, but it can hold it.