The entire oscillator is roughly the diameter of the movement itself (30mm for the oscillator alone) and is held in place in the movement by screws running through the three leaflike lobes radiating from the center. The circular outer element, however, is free to vibrate back and forth. There are three extremely fine silicon blades (or beams, as Zenith calls them, only 20 microns thick) extending from the center, to the inner rim of the circle, which perform the same role as a balance spring in a conventional watch movement: they act as springs, and are the restoring force on the oscillator. One of the most interesting features of the oscillator is that the outer circle is not a simple, single ring; it's split in three places, which are mechanically linked by a double silicon blade, extending from an L-shaped terminal to each of the ring segments.

The three ring segments have oval slots in them, which receive tiny pins; these act as an anti-shock system, to prevent excessive lateral displacement of the outer ring segments.

You'll notice that there is no lever. The role of the lever in a conventional watch is twofold. The first is to lock and unlock the escape wheel, allowing the gear train to advance in a controlled way, thus advancing the hands. The second is to "steal" some of the energy of the gear train and use it to impulse the balance, keeping it swinging. In caliber ZO 342, the role of the lever is taken by – and you'll have to look closely to see them – two minute teeth, projecting from an outer arm of the oscillator. These are functional equivalent of the lever – also called an anchor – in a conventional watch) at about 4:00 in the image below.