The main parameters:Size: 8 * 21Origin: China， KunmingColor: BlackMagnification: 8 timesObjective Diameter: 21 mmField of view: 131M / 1000MPrism: BAK-4Accessories: desiccant， lens cleaning cloth， soft bag， strap， manual， boxed. Scope: Travel， viewing， game， performance， sports， sailing， fishing and other different purposes.Length: 9.2 cmFully expanded width: 10 cmFully contracted Width: 6 cmDiameter: 3 cmWeight: 188 gPreservation methodsTelescope optimal preservation conditions are normal temperature 20-25 degrees， the temperature is 65% or less. Place in a large temperature difference as the place or damp places， the telescope lens surface will fog or fine water droplets appear， then shall the telescope slowly to stand at room temperature to dry completely.