Detection Display
Filtered Mob Detectors will display what type of mob they are looking for while the player is near the block.
Player Detector Recipe
The default recipe for Player Detectors requires cobblestone, redstone, spider eyes, and nether quartz.
Mob Detector Recipe
The default recipe for Mob Detectors requires red nether bricks, redstone, spider eyes, nether quartz, and a slimeball.