Filtered Mob Detectors will display what type of mob they are looking for while the player is near the block.
The default recipe for Player Detectors requires cobblestone, redstone, spider eyes, and nether quartz.
The default recipe for Mob Detectors requires red nether bricks, redstone, spider eyes, nether quartz, and a slimeball.
Detectors can be set to detect within a variable range; Mob Detectors can be set to only detect one type of mob
