The LP233 water flosser with heating function comes with various certifications such as CE, RoHS, FCC, EPA, FDA, quality inspection report, UL1431 test report, hydrogen-rich particle effect test report, and sterilization efficiency test report. It is also very suitable for use in cold regions like Northern Europe and Russia. When using it, heat it for a few minutes, which can help you get rid of the icy and stinging sensation and keep your teeth clean even in harsh weather conditions.