In this episode of the TNVC University, they explain the three types of night vision options: the head-mounted goggle system, dedicated weapons scope, and clip night sight. A PVS-31 goggle system is shown in the demo and how it will work with IR laser when targeting; whilst that massive scope is a 4x night vision weapons scope; and the clip on night sight is a night vision system that will work in tandem with your weapon sights. Watch it in full below: