Specification:Model2.5x17.5ColorBrownBit3x3.6x6.2cmWeight0.09kgPrismOptical glassFilm coatingFMC film coatingEyepiece diameter8.5mmObjective diameter17.5mmWaterproofDomestic waterproofingFeatures:Ultralight and portable.Mini and compact size, can ring on the finger to watch.Optic lens, HD and clear ..