A company's wall plug-in power supplies are available with interchangeable blades. The GT-41131 series includes North America, Europe, Australia, China, South Korea Class II, South Africa, and Argentina. In addition to double-enforced insulation mechanical configurations, the supplies are available with regulated output voltages that range from 12 to 48 V dc in 0.1-V increments, with up to 30 W of continuous output power. The power supplies are housed in impact-resistant, nonvented polycarbonate cases that measure 57 × 89.2 × 35.9 mm. Modified and custom designs are also available. GlobTek, Northvale, NJ, 201/784-1000.