The SOTAC PVS-14 Arm with Auto On/Off Switch is a specialized mounting component (often called a "J-Arm") designed to connect a PVS-14 night vision monocular to a helmet mount (like the Wilcox L4G24).
Its primary purpose is to provide an automatic power-down feature that saves battery and prevents "eye glow" from being visible to others when you aren't actively looking through the device.
