Ohuhu174; Lightweight & Durable Adjustable Mini 8x21 Folding Zoom Binoculars with Black Carry Bag and Clean Cloth Diopter adjustment for fine focusing, 8 X 21 zoom binoculars Central adjusting knob assists to rapid regulate vision definition Natural rubber material prevents it to slip or shake Red membrane fully coated optics for increased brightness Perfect for outdoor sport, camping, bird watching, etc.