Mastercool's UV Flashlights feature a high intensity LED (154 - 170 microWatts per square centimeter) which can be used in super bright and battery conservation modes. All the flashlights feature a Li-ion, full discharge and cut-off discharge batteries. The No. 53518-UV includes a 110V charger and the No. 53518 includes a 220V charger. The flashlights have hours of battery life and come with UV dye glasses.