SMART OVER TEMPERATURE PROTECTION: Sun4 has 4 time settings: 10s, 30s, 60s and 99s (low temperature). When using 99s low temperature mode, the intensity increases slowly to avoid pain during treatment. CURING SMART DOUBLE SPEED: Professional 48W UV LED bulb with 365and405nm dual chip design and 36pcs LED light irradiation can cure a wide variety of nail gels twice as fast as other bulbs. AUTO DETECTION FUNCTION: One chooses among the time functions 10s / 30s / 60s to start the device. Then, the seconds are counted until the start. In addition, an infrared can be used. The dryer turns on when you put your hands in the machine and turns off when you take them out. LONG-LASTING LED LIGHT BEADS AND LCD DISPLAY: UV light has a long lifespan and is similar to daylight to protect his eyes and skin from damage. VERY LARGE SPACE: Anti-light bottom plate, easy to clean, large space, dual-use hands and feet, more user-friendly design. Professional grade UV gel nail polish lamp is not only the best choice for professionals, but also can be a perfect gift for Mother's Day, Valentine's Day, Birthday, and Christmas, etc. Enjoy the beauty of nail design with your friends and family at home.