◆ Optical glass lens and 5 different apertures ◆ 19 kinds of adjustable corrective lenses, Range of lenses： -20d~+20d ◆ Supplied by 2xAA alkaline batteries (not included) ◆ The deluxe LCD screen handle can be adjust the brightness of the light source ◆ Optical SMT LED technology, low power consumption and long life ◆ Built-instant current IC circuit, The light effect is more stable ◆ 3200k color temperature of warm white light ◆ CRl≥90%, ensure to insure real color rengition.