**Features:** AC input voltage range 100-240V, constant and precise output voltage. Safety features: short circuit, overload, and overvoltage protection. 300W cooling with internal fans; 20W-50W cooling with free air convection (cannot be used in bathrooms). Widely used in scientific and industrial research equipment, LED lighting, electrical equipment, digital products and instruments, etc. **Specifications:** : JOOLONPOR Material: Aluminum Color: Silver Power: 20W; 25W; 30W; 50W; 300W (optional) Input Voltage: AC 100-240V Input Frequency: 50-60Hz Output: 20W: DC 5V 4A 20W 25W: DC 5V 5A 25W 30W: DC 5V 6A 30W 50W: DC 5V 10A 50W 300W: DC 5V 60A 300W Weight: 90g / 3.17oz (20W); 112g / 3.95oz (25W); 175g / 6.17oz (30W) 183g / 6.46oz (50W); 737g / 1.62lb (300W) Size: 20W and 25W: 85 * 58 * 35mm / 3.35 * 2.28 * 1.38in 30W and 50W: 110 * 78 * 36mm / 4.33 * 3.07 * 1.42in 300W: 215 * 113 * 50mm / 8.46 * 4.45 * 1.97in Packaging Weight: 104g / 3.67oz (20W); 125g / 4.41oz (25W); 199g / 7.02ounce (30W) 201g / 7.09ounce (50W); 783g / 1.73lb (300W) Packaging Size: 20W & 25W: 90 * 66 * 40mm / 3.54 * 2.60 * 1.57in 30W & 50W: 115 * 82 * 42mm / 4.53 * 3.23 * 1.65in 300W: 220 * 117 * 57mm / 8.66 * 4.61 * 2.24in **Notes:** 1. Please allow 1-10mm error due to manual measurement, thanks for your understanding! 2. Do not confuse the housing with the neutral line to ensure safety. 3. Double-check the terminal fixation to ensure that the input and output, AC and DC, single-phase, multi-phase, and positive and negative voltage and current values are correct. 4. For indoor use only! **Packing List:** 1 * AC Power Supply