Here s how it works: Each time the brakes are applied your brake light will rapidly flash on & off 4 times slow flash 4 times and then solid until you release the brake. The preprogrammed cycle will start over and repeat each time the brakes are reapplied. Features: Brake Light Flasher Safety Module This will alert the traffic behind you to STOP!!! Prevent Rear-End Collision and May Save Your Life! Specifications: Input Voltage: 12-16V Output: 12V Rated Input Current: 0.8A to 1.2A Rated Power: 10W to 15W Working Temperature: -40 to 50 Degrees Celsius Storage Temperature: -50 to 80 Degrees Celsius Material: High Quality ABS Plastic Condition: 100% Brand New Installation: Compatible with regular brake lights and LED clusters One module converts one brake light for left and right side brake lights use two modules Dimensions: 5cm L x 2.5cm W x 1.5cm H Wiring: Black = Negative Wire (-) Red = Postive Wire (+) Package Includes: 1x Dyna Flash Brake Light Flasher Module 1x 3M Tape Instructions not included Compatible with: Nissan / Volkswagen Beetle Bora Golf GTI Jetta