Please kindly noted that this item is sold by third-party sellers from Joybuy marketplace.Description Are you looking for a professional yet affordable car anti-collision warning light? Are you in search of a sturdy trustworthy tool that can do multiple jobs at once? If yes look no further! Our professional must meet you needs. It is one of the best choices for you. Features - Color: Red. - Material: Plastic. - Size: 2.5 x 2.5 x 1.8 cm. - Effect: When the door opens the red light flashes very fast warning the rear car to avoid accidents and collisions when the light is dim. - No wiring design: to the original line just the way of DiY paste can warn. - CR2032 button-type battery: The product uses CR2032 button-type battery with screw design and can replace the battery by itself. - Excellent heat dissipation low power consumption and long service life. - Environmentally friendly no light pollution and energy saving.