The 19mm buttons have IP65 ratings and the 22-28mm buttons have IP67 ratings. The 22-28mm buttons are better suited for marine use that may be in contact with water. The description of the buttons will have their IP ratings listed. See below for a guide.
The buttons can not handle a large amount of current like a toggle type switch due to their design and build so will require relays to be used for the majority of applications like horns, light bars, engine fans and compressors etc. You will find in most car applications there are already relays installed for the majority of accessories. When installing new accessories just make sure you have a suitable relay to take the load from the switch so it will last a long time. If you are unsure about wiring I would advise you to speak to your local auto electrician for help before purchasing any buttons.
To be able to get a momentary button to start and stop you car, the car will need to have an engine start stop kit/module fitted to be able to start and turn off the car with a single button. These can be retro fitted to cars fitted with a push button start. I recommend you see an auto electrician to do so if you are not confident with understanding the wiring.
These switches are all universal type switches that are laser etched and can be used for many different applications. Some require tricky wiring like when using buttons to replace a 3 way switch for example, power windows, central locking or exhaust cutouts. I insist you look into using SPDT / DPST type switches for your application as all applications are different, some will require the polarity to be reversed which may need some technical wiring and some may have a control module. I highly recommend you see an auto electrician to help you out with a diagram or if you're handy with wiring try doing a google search as it may also help you understand what is needed better.
If you choose any of the postal services from Australia Post they will normally be delivered by your local postal service in your country. If choosing DHL Express your parcel will be delivered by DHL Express in your country or may be delivered by a third party if you are in a remote location.
All parcels come with a tracking number so make sure you provide the correct details when ordering so the tracking can be sent to you.
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Since we are a small family operated business I have removed my phone number due to the large amount of calls being received during all hours that cut into my personal / family time which started to affect getting orders out on time. I have invested 100's of hours into the website to answer everyone's questions and streamline ordering to help keep prices down. I understand some people may be old school and like to consult over the phone and I am the best person to talk to about the products. So if this is you I am happy to call you instead, just email through your number and a time that would suit you. Please remember we are from Australia (GMT+10) as we have a large amount of international customers. I can call the majority of countries but if I can't call your country I will let you know.