How to use this vehicle windshield sign: . Clean the windshield and suction cups with a damp cloth. . Connect the USB cable to the LED signal light. . Firmly press the suction cups onto the windshield. . Turn on the LED signal light. . Adjust the position of the LED light as needed. . When not in use, turn off the LED light and remove the suction cups from the windshield. Package includes: 1 x LED Signal Light 2 x Suction Cups 1 x USB C Dimmer Switch Cable Tip: Please do not immerse the LED light in water or liquid, as this may damage the product.