Envi wall mounted space heater has a couple of great added accessories you can get. The programmable digital wall switch timer is a great added feature. It does not need batteries. It is suited for enviwall mounted heaters as well as lights or electric motors. They offer two types of programming: conventional or solar. They are ideal for energy savings and safety applications. The other is a programmable or non-programmable thermostat. You can control up to 3 Envi space heaters at one time with this thermostat. You never have to come home to a cold room again! So safe and so efficient! Envi costs only 4 cents a day to use. Save money and keep warm with eHeat Envi! Visit www.eheat.com to learn more and call 800-807-0107 with any questions you may have.