This is a 9watt single tray heated propagation system without a thermostat. It is suitable for one seedling box (seed tray, drip tray & 3-way vented lid). This is made to Australian standards and comes with a 2m cord. It is water resistant and heats up to 10 degrees above ambient temperature. It measures 300mm (L) x 400mm (W). All Heat 'n' Grow heat trays come with a 2 year warranty. This system uses a high-tech carbon plastic element. This ensures that you enjoy very low operating costs, from less than half of one cent per hour. This heated tray by is best for hydroponic growers and serious gardeners. By using bottom heat propagation systems, you'll have the benefit of controlled growing conditions. This promotes faster, better, stronger and healthier growth, and the opportunity to grow exotic plants, flowers, herbs and cacti all year round. This heated growing mat automatically warms your plants or mushrooms to the perfect growing temperatures.