From Halopedia, the Halo wiki
The remote sensor has multiple observed modules, each with its own distinct physical appearance.
The AN/PZY-990T STARLIGHT optical sensors integrates directly with Mjolnir VISR drivers and intelligence analysis systems to provide real-time situation updates to commanders.[Note 1] It resembles a camera, and is typically worn on the right side of the helmet.
Manufactured by Chalybs Defense Solutions and compatible with the CH252 helmet, the PZY-955SSA WILLOW remote sensor is dependable and natively compatible with older UNSC and CMA encoding formats.[Note 2] It is typically worn on the right side of the helmet. It can be employed alongside a Command Network Module or a CBRN module.
Although it was previously available only to Beta-5 security teams and select Army rapid-reaction forces, it was also employed by Orbital Drop Shock Troopers during Fall of Reach. By 2558, its use was adopted by Spartan-IV personnel employing the Military Police helmet, which also employs an integrated Command Network Module.
The SABERTOOTH was developed by Lethbridge Industrial as a new third-generation of remote sensing device to feed newly trained battle management smart AIs. The SABERTOOTH module has been observed to be compatible exclusively with the ANUBIS-class Mjolnir helmet, which was also manufactured by Lethbridge Industrial.
The remote sensor serves as a cosmetic option and has no impact on gameplay.
There are two RS modules available as attachments on several helmets in the armor permutations of Halo: Reach. The device is priced at different levels of Credits, depending on the base helmets. In Halo: The Master Chief Collection, the same RS-attached helmets are unlockable in Season 1: Noble.
Halo 2: Anniversary
The STARLIGHT remote sensor is available for use in the multiplayer component of Halo 2: Anniversary as a helmet variant - introduced and unlockable in Series 9. The attachment is present on the Breach Scout helmet variant, and is present attached onto the side of the Mark VI helmet among other upgrades.
RS attachments are available as customization options in Halo Infinite. The release of Halo Infinite was accompanied by a series of retcons, with a CNM being re-designated into the TAC/RS/STARLIGHT attachment, and a module that was previously known as the HU/RS package being re-designated into the TAC/RS/WILLOW attachment. The TAC/RS/STARLIGHT and TAC/RS/WILLOW attachments are the only known helmet attachments categorized under the TAC category of armor accessories.
List of appearances