This replacement lens cap is designed for the Nightfox Prowl only. it serves as a replacement for the lens cap included as standard with the Nightfox Prowl. Made with 2mm stained glass, the lens cap is designed to protect the harder-to-replace camera lens behind it. The lens cap does not have to be taken off while the monocular is in use. Ideal for replacing lost lens caps, or if you always want a spare to hand.