The Echo Visor is a Luminoth device that possibly was originally intended for blind Luminoth, but later repurposed for use in Sonic Security Systems. It uses echolocation to see, sending out sonic pulses regularly to navigate the blackness seen through the visor.
When Samus Aran found the Echo Visor, it added a sonic pulse to her beam shots when used, allowing her to disable sonic transmitters. When she had obtained the Annihilator Beam, it then allowed her to operate Sonic Key Systems.
- Metroid Prime 2: Echoes (First appearance)