uv gel lamps 18 watts plug shape : flat ,round ,triangle voltage :110v,220v time switch is diffeent Product Name: uv gel lamps 18 wattsitem no.:NL-4Product Description: 18W UV Lamps for nail art. 1). Power: 18W 2). Voltage: 220v 50Hz; 110v 60Hz 3). Wavelength of highest peak=370nm (Harmless to the eyes. ) 4).No Timer