O-Best Super Clear 18x52 Dual Focus Telescope Optics Zoom Monocular Scalable Telescopic 103m/98500m with Pouch Use waterproof design: the mirror is full of the high-purity nitrogen, waterproof and antifogging. You can use it in raining day and humid environment, and have no need to worry about this item Dual Focus design: can look much longer distance and more distinct Size: 15 x 5.7 x 5.7cm The monocular offers an 18x magnification and a 52mm objective diameter The viewing filed: 103m/98500m