It cooks your food to perfection using only steam. The product has an internal metal core, which keeps the microwaves out. It's an amazing and innovative steamer.
The Crystal wave Ramekins work really well with it -- see them both in action in this demo video (it shows the product in purple, not the green or "cosmos" grey I have).
Use it at max 800W. If your microwave goes higher, take it down a bit.
26.3 cm diameter x 13.7cm high