Bert&Bratt products have a small UVGI light that kills germs using a dual-action process.The oxygen in the air reacts with a range of 254 nm wavelengths creating ozone to safely eliminate up to 99.9% of germs and bacteria. The only by-product of this process is oxygen, leaving the pacifier without any residue or harmful bacteria. Simply push and hold button until light flashes. When flashing has stopped, sterilization has occurred. It breaks down bacteria and exposes the DNA/RNA, quickly destroying the cell.