Heated Mini-Greenhouse growing systems offer enhanced growing success by providing gentle warmth to your plants and by controlling humidity under the dome. Each system includes: a UL listed waterproof heating mat (17 watt, 120 volt) a dome top (7" tall on the Hot House) 11" x 22" watertight base tray 72 cell seedling inserts (1.5" square x 2.25" deep cells) instructions. Hot House dome has two ventilation points on the top. Heating mat is designed to reach a temperature that is 10-20 degrees fahrenheit above ambient air temperature.
For this price, I think the tray and planting cells should be of studier quality,Review by charkee (on 6/8/11)