Designers are working on energy harvesting technologies that can efficiently generate energy from heat, vibrations and radio frequency waves. Energy harvesting may not be able to power mobile handsets, but it can be used for low-power systems such as portable medical monitors or home automation devices. The technology does not revolve around energy or cost savings, but more on enabling compelling applications. Energy harvesting could be especially useful in new technologies that call for microprocessor-based devices. There are several technologies for harvesting energy, including that from EnOcean, which has products for home- or building-automation applications. EnOceans switch for lighting control, for instance, could possibly be applied for controlling powered draperies, fans, or other devices. EnOceans PTM 200 switch is not exactly an energy harvester, but when incorporated with EnOceans ECO 100 electrodynamic harvester, enough power is generated to awaken a processor and radio in the switch module. Three short duplicate message packets are then transmitted to a receiver, which can be integrated into a light fixture. Thermal harvesters benefit from the Seebeck Effect, which allows thermocouple to harness power. Designers of energy harvesters, however, face the challenge of bringing down the cost of the technology to drive it to a broader market. Currently, several universities and R&D groups are working to reduce the cost of the technology.