These flexible cables fit in practically any growing area. The built-in thermostat maintains a constant temperature of 25-30°C (77-85°F), which speeds germination and encourages strong growth. Lay down two inches of sand, and then arrange the cables so that they are spaced about 8cm (3”) apart. Then add another layer of sand or soil to the desired depth (deeper for less heat, shallower for more). The area is then ready to use as a permanent propagation table for seeds, seedlings, and cuttings. The cables are designed to run 24 hours a day, as needed. They come in three sizes, with full instructions and safety precautions included. (32W/120V/0.27A).