PWM Module: GTR Ultra 2.0 (Pair / H11)

Pulse Width Modulation: Is frequently found in the electrical systems that run the headlight circuit in many modern vehicles, and when it comes to HID or LED upgrades, that's a problem since it results in constant flickering on the new setup Do you need these? Not sure whether or not you'll need these when doing an upgrade on your vehicle? Check out the rule of thumb guide in the tech specs below for some information to help you make the best decision. If you are unsure, GTR Lighting recommends installing the PWM Modules, since it wont harm anything even if un-needed. Anti-Flicker: With their powerful Capacitors system inside, these will absorb the pulsing current coming from your factory wiring and smooth it out before it causes your LED bulbs or HID ballasts to flicker. In most cases, they can be used alone, and in other cases, can be used in conjunction with a relay harness to ensure smooth, uninterrupted power delivery. Construction: GTR Lighting is known for producing the highest