The HSR-IV is a ingame piece of armor used primarily by WATCH. The item can be purchased at the locker room in the Watch Precinct for 2500 E-Cash. According to the ingame description, the HSR-IV is formed of a carbon/steel composite material and also can display live information about crowd formations in real time. Adding onto that, "HSR" stands for "Heavy Special Response", and is only used in situations where maximum protection is required ie. armed raids, high risk situations, hostage situations, etc.
The HSR-IV armor helmet contains a digital AR interface that displays an image obtained from four cameras. Two of them support the infrared spectrum, while the rest display the standard visible one. The digital interface displays the image on the internal displays for improved safety of the user from direct hits on the front of the helmet since only sensors will receive damage and the internal ceramic plate will suppress the inertia of the projectile, however, a disadvantage may be count in vulnerability to electromagnetic pulses and cyber attacks that could completely disable displays until reboot or replacement. This kind of interaction will completely make user blind. Additionally, the helmet contains a built-in headset containing nine communication channels using both a local network and classic tuned radio frequencies.
The chest plate of the kit contains 9 plates on the front side and 6 on the rear side based on an alloy of steel and manganese with an external and internal coating created from carbon fiber fabric, as well as nomex fibers. The inner soft layer has an increased thickness relative to the outer one centimeter in order to increase the damping force. The total weight of the protective kit without additional equipment is 14.3 Kg.
- The Heavy Special Response 4 was developed by scientists most likely after being contracted to.
- The 4 in the name probably infers that there were 3 predecessors to the HSR-IV.
- The HSR-IV was developed only for high risk situations contrary to the belief that it was mass produced and to be used commonly by new players.
- The armor rating estimate of most community members is a NIJ Level IIII, able to stop up to 15 millimeter projectiles.
Exhibit A : The text on the right side of the helmet. It reads : 海 坊 主 or "Coast Guard Unit" in Japanese (and it can also be read like that in Chinese, because those two languages have many of the same words).
Exhibit B : The Blurred text on the pack of the HSR-IV, it is currently too blurred to be translated, but seems like 'Naval Commander' in Japanese and "Police" in English.