1. This product is freely back and forth axis in the same time, but also move up and down, high and low lights lights in the distance effect is more perfect. So as to avoid certain products of similar products in the same time stretching before and after the optical axis does not move up or down, and high and low lights of the lights in the same location, but lack of lights in the shape is different. 2. Lamp with three screws, can be adjusted according to the different lights in the headlights, head of the reflector cup to the top dome can be removed, and prevent some of the inside of the small reflector headlamps h4 withstand high and low lights can not be installed in place. 3. Installation is simple and convenient, for some position behind small car headlights, the overall level of H4 light installation is very difficult, I developed the H4 high and low lights for the two-part removable installation, you can remove the head first into a large lights, cover waterproof cover, and then head inside the bulb part of the load, so you can easily complete the installation. 4. Waterproof outstanding performance, the installation of two water-proof ring greatly enhance the product's water resistance. 5. H4 low lights because the controller has the function of polarity, high and low lights of the conversion adjustment of similar products not being prone to short-term loss of optical phenomena, but also to make it super stable and changes in the characteristics of flexibility and control waterproof performance, installation is very convenient and simple. 6. Excellent product quality make the H4 high and low lights stretching more than the number of 13 million, and the materials to high temperature of 330 degrees.