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.
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