cgjxsbinoculars maifeng 10 -30x30 10x -30x magnification bak4 prism monocular zoom hd telescope universal smartphone p clip holder t1910

maifeng 10-30x30 magnification bak-4 prism monocular.main features:.- made of 100 percent optical glass and military coating, professional level.- 10- 30times adjustable ring design, satisfies different requirements.- bak-4 prism offers you brighter view.- 15mm diameter eyepiece and 30mm diameter objective lens.- adjustable spiral eyepatch of eyepiece can transform the distance of exit pupil, and suits for people who wear glasses.- suitable for boating, bird watching, auto racing, horse racing,