... ,Up to 6~7 hours continually work(level 1 digital zoom) Care your eyes, Care your vision—Vision ... operate3 Up to 6~7 hours continually work(level 1 digital zoom)4 Freeze function5, 8 viewing modes: Full ... used as turn ON/OFF, and handle8, 4 digital zoom levels(1x/2x/3x/4x)9, 4 brightness ... lights/Preferences saved realtimely/TV output(TV version) Low vision digital magnifier real manufacturer in China