Laser Block

The Laser Block is a block added by SecurityCraft. Multiple Laser Blocks used together will create laser "tripwires", which can be used to emit redstone signals whenever an entity walks through it.

Usage
For a Laser Block to function, two (or more) of them are required. Place a Laser Block down, then place another Laser Block parallel to the first within a five-block range. If set up correctly, a laser will be formed between them. Additional Laser Blocks can be connected to the first two in any direction, horizontally or vertically, essentially providing an endless possible range. When a player or mob crosses through one of the lasers, the two Laser Blocks that are connected to it will emit a redstone signal for three seconds.

Modules
The Laser Block can accept two different Modules:
 * Harming Module: Adding this module will cause any lasers emitted from the Laser Block to damage entities that step through the beam.
 * Whitelist Module: Adding this module to the Laser BLock will prevent any players listed in the module from causing the emission of a redstone signal, letting them walk through the laser freely.