The sensors are eyes that seemingly slide across walls, ascending and descending while shining a harmless yellow beam that can detect intruders. They pose a major threat to Samus Aran during her early exploration of the temple in her Zero Suit: they are completely immune to her Paralyzer, and if they detect her, the Pirate Alarm System will be triggered, causing numerous Space Pirates to swarm in on her location. In addition, the sensors will begin to fire energy blasts at her.
The floating-eye sensors are considerably less threatening when Samus acquires the Fully Powered Suit, allowing her to use her full arsenal to easily destroy them.
- ^ Metroid: Zero Mission: The Official Nintendo Player's Guide, page 81
- ^ Metroid: Zero Mission ミッション・コンプリートブック