KKmoon 10-300×40 Zoom Monocular High Definition BAK4 Prism Monocular Retractable Telescope

Features:
40mm multi coated lens with 10x to 300x magnification delivers larger field of view, and clearer long-distance viewing.
Boasting BAK4 prism, fully multi-coated(FMC) quality optical lenses improve image clarity and brightness.
Twist focusing ring to adjust the focal length, and the monocular is retractable to control its definition.
Compact, durable, and easy to grip. Suitable for travel, birding, spectator sports, concerts, or enjoying scenery.
Comes with a lanyard , cleaning cloth, and carrying case.
What Are These Numbers Mean?
10-30040mm: 10-300 is the magnification, which means what you see is adjustable from 10 times normal size to 300 times, and the 40mm is the Objective Lens Size.
10-3025mm: 10-30 is the magnification, which means what you see is adjustable from 10 times normal size to 30 times, and the 25mm is the Objective Lens Size.