Signal Dynamics Back Off XP/Brake Light Signal Module Compact; solid-state electronic module converts brake lights into 2 choices of visual alerting signals when brakes are applied Mode one emits 3 short flashes followed by one long flash (3.5 seconds); Repeats as long as brakes are applied Mode 2 emits 5 short flashes followed by a steady on light; light remains on until brakes are released Specifications: 12V DC, max. capacity 10A, sealed weather-resistant heat sink case, 2 1/4in. L x 5/8in. H x 1 5/8in. W