1、A dry battery box is designed at the bottom of the warning light to facilitate the installation of 4 x AA batteries(not included). More convenient during use. 2、The bottom magnet, strong magnetism, can be adsorbed on the metal surface without installation, convenient and quick. 3、Red light cover is waterproof and dustproof, and dust will not enter the inside of the alarm lamp. 4、The appearance is designed with bullet head, the texture is hard, and it can adapt to the harsh environment. 5、Suitable for traffic construction site signal light, flash, road barrier light, alarm light. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.