1.Comfortable Headband design distributes weight and lessons pressure that can cause discomfort and headaches. 2.Ultra-wide field of view without distortion keeps your eyes from getting tired 3.Galilean Optics system offers extra wide field of view with clear vision throughout 4.Unique optical coating reduces reflection and improves image clarity 5.Other viewing distances available, including custom distances, see description for details Specifications Maginification:3.5x Working distance:280-380 mm Field of View:60 mm Material of lens-barrel: plastic andoptic glass Headband with Leather Color of lens-barrel: white Frame: headband mounted Optical system: Compound Optics Certificate:CE LED Light Power: 5W Light Intensity :65000lux Lifetime of led :20000h Spot size(420mm) :1-9mm Working time : ≥6h Charging time :4h Input : AC100-240V/50-60Hz Brightness :Ajustable Spot size: Ajustable Box size: 26.5*23.5*16.5cm |