The AN/PVS-14 comes in many different packages with a plethora of image tube specifications. The L3 Filmless image tube is one of the best image tubes available for use in a night vision monocular and we list each option by it's specifications. Before you purchase a PVS-14 try to understand these specifications and how they will affect image tube quality. Simple user controls on the PVS-14 include a 3-position switch (OFF/ON/Momentary and constant IR). The system's Generation 3 image tube features Automatic Brightness Control and is protected by fully-automated sensors that shut off the unit within seconds if accidentally exposed to bright light. Sophisticated electronics turn off the PVS-14 when removed from the head or helmet mount or when shifted into to the “UP” position.