Alternating Flashers - Models 03.W125 / 03.W126 / 03.W3041 - For use with halogen and incandescent light heads. 90 FPM per side. Custom flash rates available. Override feature works with the vehicle's high/low beam switch to prevent high beams from flashing. Model 03.W3041 is compatible with vehicles with ground-switching (GS) headlights. Model 03.W125 is compatible with some daytime running lights (DRL) and requires a separate power switch. Model 03.W126 has an additional low-current control wire which permits operation from an existing low-current switch. 100% solid-state. Waterproof. Made in the U.S.A.