Just a word of warning to anyone who thinks adding a modulator to their headlight, brake light or signal/running light. A malfunction, as happened to me, will place you in a very hazardous situation. Communicating your intentions to cage drivers is paramount to your safety. When you find yourself is low-visibility, on a highway and your signal and brakes suddenly start sending out confusing signals to everyone behind you, you are in more DANGER than you would have been had you been driving with unmodified electrics. KRISS WILL NOT RETURN E-MAIL OR ANSWER PHONE CALLS!!! (CORRECTION: it took two months, but they called me back about an hour after I posted) Returns without an authorization number will be discarded, but there is no way to request an authorization without being actually speaking to them. The phone number listed is a cell that is never on - or at least not when I have called. Their answering service has been shut down - they explained that they felt it was a waste of money.