1. The shell is made of -quality materials, which is not easy to be broken and very durable. ^^2. Large fan design, better heat dissipation and longer service life. ^^3. It needs a wide voltage of 100-240V to work! ^^4. The efficiency is as as 80 to reduce your electricity bill. ^^5. Complies with ATX 12V V 2.3. The fan speed is automatically controlled by the thermal sensor inside the power supply