From Pathfinder #194: Cult of the Cave Worm, which isn't enabled.

Thumper Snare

ITEM 3

RARE AUDITORY CLOCKWORK CONSUMABLE MECHANICAL SNARE TRAP

Price 10 gp

Usage held in 1 hand

Bulk —

Category snare

This small box contains a clockwork mechanism that rhythmically thumps the ground, allowing creatures with tremorsense to detect it at up to double their usual range. The mechanism can be wound to thump anywhere from 1 round to 1 minute before falling into useless components.

Pathfinder #194: Cult of the Cave WormOGL