Single Hand Focus: Ergonomic design helps you focus on your target quickly and accurately with one hand. Waterproof and Fogproof: Prevents moisture, dust, and debris from getting inside the monocular designed to inhibit internal fogging. For any weather and any environment. Not only can you see objects 13 times closer with this monocular, with 50mm objective lens you can even calculate the distance between you and the target and the size of your target. 13X50 Magnification: With a 50mm lens for 13 times closer viewing distance and a clearer, brighter field of view, the powerful handheld monocular also provides a comfortable, clear view. 1/4 Inch universal tripod interface: The greater the magnification the more shake you get. This is easily compensated for by bracing against the tripod, only using a universal tripod with standard international 1/4 tripod Interface (no included).