Features:1. Ergonomic and unique optical designed of bleaching adaptor2. High uniformity of light output3. Durable and flexible gooseneck tube for 3-D position operation4. Versatile selection for curing time presetting5. Digital indicator with audio feedback6. Quiet and powerful fan for best cooling7. 100 to 240 Volts AC 50/60 HZ suitable for universal use8. Compact and lightweight for easy operation between rooms