This flexible cable fits virtually on any growing area. The built-in thermostat maintains a constant temperature of 25°-30°C (77°F-85°F), which accelerates germination and promotes strong growth. Spread two inches of sand, then arrange the cables so that they are about 8 cm (3”) apart. Add another layer of sand or soil to the desired depth (deeper for less heat, shallower for more). The area is then ready to be used as a permanent propagation table for seeds, seedlings and cuttings. The cables are designed to operate 24 hours a day. Complete instructions and safety precautions are included. (32W/120 V/0.27A).