Night Optics Falcon 6x Gen 3 Gated Long-Range Night Vision Binocular - Manual (Page 72)

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Figure 2-8. Battery and Eyecup Installation.
(4) Replace battery cap by pushing and turning it clockwise.
Tighten it firmly to ensure a watertight seal.
2-7 INSTALLATION OF EYECUPS
Install eyecups as follows: Refer to Figure 2-8.
(1) Carefully press each eyecup over the diopter cell
retainer.
(2) Rotate each eyecup into proper viewing position. Adjust
for best eye fit. The eyecups must seal around your eyes to
prevent the green glow from escaping.