... surface use uv spray-finishing, bright colors.2.install high quality li-ion battery,fully power supply.3.dual circuits protective ic, ... surface use uv spray-finishing, bright colors.2.install high quality li-ion battery,fully power supply.3.dual circuits protective ic, ... surface use uv spray-finishing, bright colors.2.install high quality li-ion battery,fully power supply.3.dual circuits protective ic, ...