·Light meter attached. ·Built-in fan to avoid heat. ·The battery can be replaced. ·OLED screen. All angles visible. ·Automatic memory. Avoid setting frequently. ·Ergonomics design, more comfortable in operation. ·Three working modes with three criteria of light intensity.Stable output of light intensity, the solidification effect is not affected by the consumption of remaining power. ·Efficient transfer from electricity into light. A full charge can be used for more than 500 times continuously under 10s working time mode.