A double-sided, multi-layer broadband coating with high light transmission; The use of high quality and high magnification to ensure good imaging and viewing comfort; The use of a low throw process for increased accuracy rates; Thanks to the BaK-4 roof prism and full multilayer coating (FMC), the handheld telescope not only has a more aesthetically pleasing and compact construction, but also an excellent light transmission of 99.8% and outstanding brightness. The PPS material of the housing makes the tube strong, slip and weld resistant; the brass bolt holes ensure a tighter connection between the telescope and the stator. parameter: 10X42Lens material: BAK4Coatingmultilayer coatingEyepiece diameter: 22.5mmObjective diameter: 42mmVisual range: 211ft@1000ydsWeight: 330gSize: 145*55*70mmObjective aperture: 42mmEyepiece aperture: 18MMPupil diameter:4.2mm Included:"storage bag*1Instruction booklet*1Dustproof cloth*1Lanyard*1Mobile phone stand*1Tripod*1"