I am in sales and therefore travel in my car daily. After 6+ hour drives I used to find myself irritable, tired and always with a headache. Last week I plugged the [CHI Guard] into my car’s adapter and this was the first time I did not have a headache after my long drives. I felt more alert throughout my day and the long car rides were much more enjoyable. It’s also so convenient that I can still charge my phone through the USB slots. I love this product!