Quoted from snakesnsparklers:Toyota and Lexus (and many others) keyfobs have a physical key inside them that can be released, usually this is the part with the ring to hook onto your keys. This will unlock the driver's door. To start the car you hold the keyfob up to the start button, hold the brake pedal and press start. There is an inductive coil inside the start button that will provide just enough power to activate the security circuit in the keyfob to let the car recognize it and start.
That’s freaking brilliant. I love how they thought that through and the technology. Totally cool.