Easy to install, no wiring / drilling / bolting required, just plug and play. New Brightest 5 COB LED technology anti-collision lights, a necessary accessory for your car. Essential safety reflector light to ensure safety for you, others and your vehicle. Waterproof Design with silicon ring gasket, is durable and ensures long time use. Magnet induction design and wireless fit, such that when the door is opened, the flashing red light warns pedestrians or the rear vehicles to avoid accidents. No extra batteries required. We are providing the required 3V CR2 coin batteries with each sets. NB:- Please mark the exact mounting point on the car door and door panel ( inner part ) on the parallel opposite sides in the same line. Remove any oil or dust with a clean and dry cloth. Put the 3m double sided tape first on the light back side, then fix the kit on the exact marking point. Please fix the kit on the first chance avoid the undoing of fixing the 3M sticker as this could make the 3M sticker weak for holding the door light kit on the car door panel. Product Description: Product Dimensions:5.7 x 4.9 x 2 inches Color: Red Features: wireless design,safety,waterproof,red rear door side signal reflector. Applications: fit for any cars, SUV, truck, vehicle, home door. Three warning styles of performance: 0-7 Seconds: Rapid Flashing 7-60 Seconds: Sequential Flashing 60-110 seconds: Slow Swirl Flashing Automatic power off after 110 second. Installation Tips 1. Clean up the place you want to paste 2. Open the red cover , put it inside circuit board; then close the lucid base 3. Heating the extra large/small white tags for seconds before sticking for increasing their viscosity (please do not stay too close 4. Peel the light white paper off from each magnets, press 5 seconds at least then stick to the car that corresponds to the lamp position closing the door 5. Then the door warning light installation finish!