SUN X9 Pus Professional LED UV Nail Dryer Lamp Salon Curing Manicure 48w A8. Auto Sensor Design -when detecting your hand in the uv led lamps, it will start working automatically. Timer Setting -the nail dryer with 3 timers, you can set the timer at 30s, 60s, 99s to cure your gel nails. Smart Over-temperature Design -it detects internal temperature automatically in long term use.