AUTOMATIC THERMOSTATIC CONTROLS ** Attempting to germinate seed at low or high temperatures can seriously affect the germination percentage and the length of time necessary to produce a good quality seedling. No one can afford this high loss in germination, not just the cost of seed, but the loss of time, energy, labor, space and maybe even a customers. ** 1. Place the temperature sensing bulb in the media, approximately 3/4" below the seeds. 2. Set the thermostat dial to the temperature you wish to maintain. 3. Place the thermostat out of the way of mist systems and puddles of water. 4. Plug in up to 4 propagation mats to the thermostatic control. 5. Plug the thermostatic control into a 120 volt AC outlet making sure the cord does not rest in a puddle of water. 6. Indicator light will glow when the mats are calling for heat. 7. Comes with a 90 day manufacturers warranty. 8. 5E 161 will control 4 mats. 5E162 controls 1 mat. A $5.00 "Drop Ship" Charge Will Be Added  By The Manufacturer To All Orders. Items Are Always Shipped Direct. 5E161 Pictured (Controls 4 Mats)