They worked for the pirates! This unit which measures only 25mm Dia. and 105mm long can easily fit in your pocket. Many people prefer the simplicity of a monocular with only 1 x knob to turn you so can’t go wrong! 8 x mag with 21mm objective lens, (8x21) and water-resistant (not fully waterproof), & 10.5mm eye relief it is an excellent unit for camping, theatre or casual boating. Supplied with Nylon case and polishing cloth.