Where the ActiveE will turn the brake lights on as soon as you let go of the accelerator, the Model S relies on accelerometer readings to warn the vehicles behind you -- clever.

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We've seen plenty of cars that turn on the lights when you near, but the physical changing of the car, the handles pushing themselves out just in time to greet your arrival, certainly feels very inviting.

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By tapping out different patterns (it detects only the shock, not the strength) the idea is that you could turn lights on and off, control appliances, and so forth.

ENGADGET: A fingertap away

Other special features include adjustable width (though no adjustable weighting -- c'mon, guys), a huge "wing" on the right side meant to keep your fingers from dragging, and a software suite that lets you record macros, tweak the million on-board lights, and even turn the bulky rodent into a fairly-functional joystick.

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Through the app you can lock doors, adjust your thermostat, turn on and off lights or appliances and check your security cameras.

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