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Protect yourself from recoil and control leakage of display light with the IRD Shuttered Eyecup from IR Defense. This replacement eyecup is compatible with IR Hunter and IR Patrol thermal imaging systems and offers durable and comfortable rubber construction. While protecting you or your personnel from recoil-related injury, the shutter within the eyecup acts as a control valve for light leaving a display. This light remains shut out until your face contacts the eyecup tightly, preventing operators from revealing themselves to adversary during stealth operations.