I have just been in correspondence with CT. I have a pair of grips that has developed an intermittent switching problem. Sometimes it lights, and sometimes not. I asked them if they could fix it and what the cost would be. They stated that 1. That model had been discontinued, and 2: They have a three year guarantee, and after that they could not repair it. So...heads up suggestion: If you are planning a purchase inquire about the repair policies first. JMHO