1. Imported high-quality plastic material used to make products to the end of the long-term temperature in the heat and work. 2. New (patent) structure design, swivel snap. 3. Using a common light bulb components, can be coupled with several different models of the head above, no need to adjust light distance, direct snaps into place could be 4. Use of high quality high voltage power lines, double-protection, can be more effective prevent electrical breakdown.