Features: The power supply adopts isolation design, and the biggest advantages of isolated power supply is high safety and reliability. Because there is not direct current between input and output. Even after the power supply is abnormal, the damage to the load is very small. For example, the input Voltages will not be added to the output terminals after the break down of the switching tube, which will cause damage to the load. Input reverse connection protective: with tube input reverse connection protective. This power supply can step down and stabilize Voltages, and at the same time, it can step up and stabilize Voltages. (Load capacity is halved when boosting) It is suitable for supplying power to products with power reliability requirements. Specifications: Model: 4A isolated module (PWS39) Power supply nature: isolated step-down and constant Voltages switching power supply Input Voltages: DC12-90V Output Voltages: DC9V 12V 19V 24V (optional) Output current: 9V, 12V, 19V, 4A, and continuous operational for 3A. 24V, 3A, 2.5A Size: Approx.88x52x20mm/3.46x2.05x0.79inch Conversion efficiency: about 88%, measured under the condition of 48 to 12V 2A. Size: Approx.88x52x20mm/3.46x2.05x0.79inch Package Includes: 1Pc Step Down Converter note: 1. This product is a constant voltage power supply, and cannot be used in products requiring constant current, such as charging batteries or driving LED lamp with constant current. 2. This power supply can step down and stabilize the voltage, and at the same time, it can step up and stabilize the voltage, for example, the output is 19v, and the input is 12v-90v. Under the boost condition. The load capacity will be reduced by half.