Triad prepackaged wall plug-in power supplies decrease product design time. These plug-ing power sources eliminate the need for internal power supply cooling devices, thereby reducing the noise level, size and weight of the end product. In addition, these compact power suources keep heat away from sensitive circuits, and supply a safer lower output to the end product. Wall plug-in sources are completely enclosed to prevent tampering. They are offered in a wide range of popular voltages,power levels and reversed polarity (-R). They output volatage is regulated; which means the output voltage will not vary much with load. Models are availalble with generous six foot cord lenghts. Available in 50-60Hz operating frequency.