What is the purpose of Remote Starts and why do you need it?
Remote starts allow you to start your car remotely. In the comfort of your home or work. It will warm up your car in the winter, or it will cool your interior in the summer. Never get into a cold or hot car again. Also, if your car has ice on the windows, you can remote start the car with the heater on and after the car warms up, you can simply push the ice off the windows (no more scrapping!)
Most new cars will have immobilizer bypasses, you will need to bypass this security feature to install a remote start. There are modules to do this. This is required for almost all cars built in the last 10 years or so. Be prepared for this and the added cost. Some work on data, and can simply plug into the remote start. Using data, you can save the time and avoid additional wiring.
Some of these bypass modules will require a programmer, since they come blank
However, there are universal type bypasses which will cover one manufacturer and should cover most cars, (for example, one for honda, etc) - and those do not require the purchase of a separate programmer.
Ford, GM, Honda, Hyundai, Mazda, Toyota and related models 2001 to date. The ADS-KO covers most older cars in that group.
There are also units which are plug and play for many type of vehicles. They are more expensive, but they come with a plug and play harness which is great for novices or beginners. The majority or all of the installation simply "Y" and plugs into existing harnesses. Be sure to check model and compatibility before choosing an unit.
If the main remote start is capable, remote starts can be programmed to start by a cellular phone app. This allows you to send a remote start command when you are in a concrete building, on an airplane, underground in the subway or anywhere as long as you have a wifi or cell connection to your phone. If the system has an alarm, it will also page your phone when your car alarm goes off.