There are 8 lighting modes: 1. Constant light mode 2. Wave shape change 3. Continuous change 4. Flashing change 5. Slow flashing change 6. Bright and dark change 7. Dreamy change 8. Fast flashing change. There are two buttons on the back of the adjustment panel, on the left is the button for switching the light mode, which can switch 8 flashing modes, and on the right is the switch button. Please note that the bulb of the light string is made of plastic, not glass.