Stretchable Design: Freely stretchable design, fun and interesting, so many lovers canot put it down, small, light and portable All-Metal Frame: All-metal frame,, fashionable and beautiful BQK4 Lens: BAK4 lens, exit-pupil is a round light spots, the light-transmittance is very high, clear and bright Close Focusing: Observation range: Near landscape can see both far and near, suitable for bird watching,, hiking, camping, sightseeing Blue Film: It can high light-transmittance and low reflectivity to increase light-transmittance and a clear and bright field of view