I would concurr when used as the "keyfob up against the power button" but normally it's more of an active system. Notice that LED blinking on the FOB when you get close to your car? Also the FOB knows which cars to respond to and RFID will respond to all interrogations. I have a TCH and a conventional '07 Camry XLE both with smart start. The FOB or the TCH does not blink when near the XLE and the XLE's FOB(s)s do not blink when near the TCH. There is more than RFID built into those little suckers. Maybe the car tells the FOB when to blink?