Model FSD201,

Here's some information I came across to give you some idea of how it works.
Easily steam all kinds of food, from veggies and rice to seafood and meats, with this electronic double-decker 8-quart-capacity food steamer. Thanks to its transparent water-level indicator and adjustable 60-minute timer with digital time display and audible timer tones, cooking food according to individual preferences is simple. The unit provides two transparent steaming bowls, a 4-cup rice bowl, and a juice-catching tray. The steamer's middle divider is removable to maximize capacity, while its rapid-steam function provides added timesaving convenience. Other useful features include a simple "on/off" button, "more/less" time control, an "on" indicator light, and easy-grip handles. The two-tiered 8-quart oval food steamer measures 14-1/2 by 10 by 10-1/2 inches.

I hope this gives you some idea of how it works.