I have a scorpio i500 (I think). Came with area sensor. If anyone gets within a few feet the alarm will go off. Or I can use just the tilt alarm function. If anyone touched it or moved it, the alarm would go off. I got it for $85 on clearance. But it was an older model at the time. I think the i900's have the button-less remote. So you just put it in your pocket. When you get off your bike and walk away, the remote knows you are away from your bike and set it automatically. Then as you are walking towards the bike, the remote in your pocket dis-arms it. Pretty cool. Hope this helps...