This Wigwag Headlight/Grille Light Flasher is designed for heavy-duty long-life operation.This flasher will operate a two or four headlight system on any vehicle with a 12V DC negative ground system. Alternates the vehicles high beam at a constant flash rate of 1.9 f.p.s. or modulates high beams at 3.6 f.p.s. When used at night, the low beam headlights remain ON for proper illumination, while the high-beams flash to gain attention to increase the vehicles visibility. Features High Beam Override that interrupts the flasher sequence to allow normal high-beam function. NOTE: DO NOT install in a Dodge Dakota or Durango 1999 or newer. It may cause permanent damage to the electrical system. The flasher can only be used on halogen or LED headlight,(No xenon headlight). Specifications: Power: 12V DC Dimensions: 3"W X 1 7/8"D X 1 1/4"H Mounting: 2 screws