Listed is a two-tone pair of vintage-looking snail horns...  The tones are high and low in the box. You get both horns.  They sound good and are non-polarised (ie +- wires either terminal). All fittings are included, both also have twin spring-steel standoffs.  The diaphragm half is steel, the bellows side is plastic. They are waterproof too.

Obviously if your car already has a relay / horn button setup, then leave it alone.  For a new re-wire, or non-car setup.... there is no need to use a relay with these… modern horns are far more efficient than old-school ones, but using twin 20 amp rated 3sqmm will sure help. and beware cheap toggle switches as many cheapies have poor contact-flashing (fails early)... buy a good USA reputable one.  Maybe a relay would help with this switch problem... not because it NEEDS a relay per se, but simply as the main switching is then carried out by the 30A relay, the switch only doing a secondary job. But normal OE horn buttons will be fine to run these direct with no relay.  

 Use the two mounting stand-off bars, so it resonates and works properly. 

These are not polarised… ie it makes no diff which way round you connect… one pos, one neg.  Easy!! You can't go wrong... just piggy back the second on the first without worrying about pos and neg. 

** They work well...  these are cheaper simply because I went to China (with my buffoon-Chinese) and have them imported directly to me from a company in China that makes ONLY horns in a clean modern factory... no 101 wholesalers and retailer and corrupt-ozzie-dock ripoffs in the line... made to international ISO9001 manuf standards and sold all over Europe, Japan and USA...   

If you have an issue, simply ask me and I will reply or ring you, I'm an old ocker right here in Oz... no sleight-of-hand remote sales.

I shouldn't have to say this.... BUT.... (sigh)....obviously the can of Coke is just for an immediate visual-scale to help you.

 To look for items in my shop, the easiest way is to save any one of MY 2600 items in your watchlist... Then,  whenever you want to peruse my 2600 items... simply click on the hyperlink called “visit store” at the top right of this item.  That will take you to a page with my 50 store categories... which will allow you to narrow down what you’re after.

Plodding through the Ebay mire of the general search box... or the “see other items” hyperlink  is simply the way to insanity.

If you’re using Ebay’s useless mobile app, I’m sorry... I have no idea how you will find them… this app is a real shocker/compromise in quality and half the stuff is missing. Go to your PC is my advice.

SHOP-category examples “ALTERNATORS” or  "BRAKE"   or   “badges” or "TRAFFICATOR parts"   or "LIGHTS"   or   "AXLES"   or   "COOLING"  or “SWITCHES” etc etc