Red and Blue Dual-Color LEDs Red: Elasticity care, activation of skin cells Blue: Skin irritation, acne care [How to Use] Connect the main unit to the controller, press and hold the power button for about 3 seconds to turn it ON, select the lighting time with the M button (5/10/15/30 minutes), press the power button again to display the timer, and the LED will start lighting. Charge the controller via the USB type-c port. Instant purchase OK! Ships within 24 hours!