The Grand Top Propagator from Bio Green is a thermostatically controlled propagator with a generous 65 watt heat output. Bio Green Grand Top Digital Propagator features Strong UV stabilised Cover Protection System. height 40cm for big plants. thermostat, accurate control 0 40 degrees C. Flexible UV stabilised clear cover, Digital Thermostat with soil temperature probe. The Heat Mat measures 36cm 14 x 70cm 27.5 and will hold up to 3 full sized 38cm Seed Trays. High 40cm 16 top, great for tall plants. Will provide rapid and strong plant growth.