Modulator pulses headlight for extra daytime visibility
Features "Heads Up" Alert: pressing horn button makes headlight flash 3 times
Surge protected. auto night shut-off
Compact size- 2 1/4" long x 1 5/8" wide x 5/8" high
weather resistant heat sink case
1 year warranty

This is an awesome safety feature!

The driver that hits you will always say, "I didn't see him"

Plug and play H4 Dual Adaptor (for modulating both headlights)