BAK4 Prisms FMC multi-layer lens coating strengthens the key function of a monocular, ensures good light transmittance and brightness, makes your vision clearer. Telescope monocular with finish made of rubber for shock resistance and a firm and comfortable grip, durable.It can be used normally in harsh environments Low night vision performance makes it effective in night vision such as a concert or a football game at night. These monocular binoculars are waterproof, fogproof, dustproof and shockproof Perfectly enjoy your monocular.Ideal for hunting, climbing, bird watching, scenery, concerts, sports, hiking, campingTips: 1. Do not use this monocular to view the sun directly, otherwise it may damage your eyes. 2. Wipe the lens with a dry, soft, lint-free cloth. If there are stubborn stains, please use the cloth moistened with alcohol. 3. The light intensity may affect the focus function of the product.Please adjust them patiently to make the vision clearer. 4. When the phone connects to a monocular, the image is circular and the surrounding area is black.Please enlarge the image and you will get a full size image. How to connect the phone to the monocular ? 1. Attach the phone to the phone holder (fits most smartphones). 2. Turn the screw counterclockwise to loosen the bracket. 3. Adjust the hole to match the phone lens, then turn the screw clockwise.Make sure it is tight. 4. Attach the monocular to the tripod: Rotate the tripod clockwise into the bottom port of the monocular telescope. 5. Connect the smartphone monocular: Firmly push the monocular telescope into the collar. 6. Adjust the wheel to focus and magnify the phone screen to remove black borders.