Essentially, the MoniMoto 7 GPS Tracker/Alarm is a tiny, battery-powered box that you hide in your motorcycle. The batteries in it last for up to a year, and can be replaced with two common lithium AA cells for about $5.
It also comes with a little battery-powered keyfob. If you move the bike (or hit it or sit up on it, etc) without that keyfob nearby, it goes into alarm mode. At that point, it actually CALLS your cell phone to alert you, and begins transmitting a GPS position every five minutes to the app running on your phone. If the bike is put somewhere that it can't receive GPS, it still sends a position derived from cell towers.
If you accidentally leave your key (with the keyfob!) in your bike, and the bike gets stolen, you can still put it into alarm mode from your cell phone, and it will begin tracking once more.
It actually works REALLY well! I'm pretty impressed with it, and it's now installed (hidden!) in my bike. Here's my video review:
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Here's the link to it: MoniMoto 7 Tracker Alarm/GPS