A:Answer The reason your brushes cost $60 for an eight pack is because apparently Phillips thinks we are too stupid to monitor the wear of a toothbrush, so they put a microchip in the base of each brush head so that it can track how long it’s been used. It is not only inaccurate but irritating. If you want, you can go on the bottom of your brush head and take a tweezers and pull the microchip off and throw it away. When you do that, you will no longer get that light and you can monitor the wear of your tooth brush like a normal grown a55 person. I attached pictures, the first with the microchip, the second with microchip removed. Hope that helps three years later from the original question.