You sense the presence of any trap within 120ft. A trap, for the purpose of this spell, includes anything that would inflict a sudden or unexpected effect you consider harmful or undesirable, which was specifically intended as such by its creator. Thus, the spell would sense an area affected, a glyph of warding, or a mechanical pit trap, but it would not reveal a natural weakness in the floor, an unstable ceiling, or a hidden sinkhole. If you know a trap is present within 120ft and you spring one within that area, you gain +2 on your Saving Throw against taking damage from the trap (and that trap only.)
This spell merely reveals that a trap is present. You don't learn the location of each trap, but you do learn the general nature of the danger posed by a trap you sense.
The first wizards to cast Find Traps quickly discovered that it doesn't actually do what it's supposed to, for something that requires so much energy. One of the greatest sorcerers, Kelly, found a way to cast effectively the same useless spell, with some extra padding for explorers, but at less cost to the caster. This is the fruit of his labor.
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