If I didn't care about discoverability, I could reasonably reduce that to: * Lock button. Hold it down to get a honk. * Unlock button. Hold it to get the car

If I didn't care about discoverability, I could reasonably reduce that to: * Lock button. Hold it down to get a honk. * Unlock button. Hold it to get the car started; if the interior temperature of the cabin is outside a set range, warm or cool it appropriately. Make one button big and round and smooth and bright, and the other one big and square and textured and dark.