Review on 🚗 CARMOCAR Electric Car Horn Kit 12V - 135db Super Loud High Tone and Low Tone Metal Twin Horn Kit | Ideal for Cars, Trucks, SUVs, RVs, Vans, Motorcycles, Off Road & Boats (Green) by Brent Webb

The main problem is that these horns don't come with enough installation hardware - note that not a single ground wire is included. You need to purchase additional parts to make this work. Unacceptable! Also, the bolt used to attach the horns to the car is larger than the standard bolt (used on Toyota and all other aftermarket horns) which requires more work = no plug and play here!