I have a newer & better version now (photo attached, also available in black) with 3 +/- inputs for car alarm alerts/triggers and 1 output with a relay for remote immobilisation as well as GPS last position feature in case it loses the GPS signal (eg. if taken inside a deep underground carpark it will give you the GPS coordinates of the carpark's entrance). As usual, the unit and all the external antennas can be hidden under pretty much anything in your car since they do not need any direct view of the sky.
There's also another type of unit going around which I would not recommend - the all-in-one GPS GSM alarm unit with remotes, this sort of unit is more common and older. It's an all in one car security system without 2/3 point immobilisers (it only has 1 relay that won't even get activated when you press the remote), no all black wiring and/or other features, the security measures are poor and do not meet any standards for a car alarm system. So I decided to get a decent approved car alarm system such as Mongoose m80s that has 3-point immobilisers, all black wiring, code-hopping remotes and other features that meet Australian standards and then added the tracker with its alert features on it. Much better package this way. If I used this all-in-one car alarm system, I wouldn't be able to install a proper and proven car alarm system from a known brand. There's also a cheaper unit with a weaker and less sensitive internal GPS antenna built-in.