You can set off your delayed bombs at great distances.
Prerequisites: Delayed bomb discovery.
Benefit: The maximum delay for your delayed bombs increases to a number of minutes equal to your level.
If you have line of effect to your delayed bomb, you may detonate it earlier than its preset time by making a DC 20 Intelligence check; the DC increases by +1 for every 10 feet of distance between you and the bomb.
Section 15: Copyright Notice – Ultimate Magic
Pathfinder Roleplaying Game Ultimate Magic. © 2011, Paizo Publishing, LLC; Authors: Jason Bulmahn, Tim Hitchcock, Colin McComb, Rob McCreary, Jason Nelson, Stephen Radney-MacFarland, Sean K Reynolds, Owen K.C. Stephens, and Russ Taylor.