This is the new, no frills, low cost, SMiDSY Headlight Modulator. It is tiny (19mm diameter x 32mm long), very easy to install, only 3 wires and can be used on either High or Low beam. Maximum load is 70 Watts. (One headlight bulb).

The modulator automatically controls the depth of modulation between 5% & 70% depending on ambient light level. On a very bright day, the unit will operate at 70% depth (Maximum effect). On a dull day, or as daylight begins to fall towards dusk, modulation depth will gradually reduce to 5%, then, in accordance with US DOT regulations, modulation will cease at dusk.