Features: 1:YUSHI VM Series adopts high-power 365nm Ultraviolet band LED Lamp Beads produced by Japanese NICHIA company, free from UV-B and UV-C element, spectrum is pure 2:The lifetime of Lamp beads reach up to 20000 hours, efficient, energy conservation and environmental protection 3:High power output, quick start, can reach the maximum luminance as soon as switched on 4:Ultra-low power, ultra-high efficiency. Cold operated with cold light source, long term stability output the luminance 5:Optical filter is high UV transmittance transparent Quartz optical glass 6:The built-in efficient cooling fin and low noise high speed fan dissipate the heat through aluminium alloy shell integrally 7:The shell of the instrument is made of high strength aluminum alloy 6061-T6 precision machining. The surface is anodized, sturdy and durable 8:Dedicated high-speed charger is equipped 9:With anti magnetic interference function, it can be used in high-intensity magnetic field 10:Both switches and charging port are at back of the device to avoid mis-operation 11:The product has passed through International Standard of IEC 60529 --Housing Protection Grade(IP66)--dustproof and waterproof testing, wider working environment and more reliable