NOTE about the noise about 1500W PSU: There is a high-frequency noise when the switching power supply is unloaded, Due to the large output power range of the product, in order to reduce the power consumption of the switching power supply when no-load, the PWM control chip jump some control cycles. Assume that the working frequency is 60KHZ. If there are more skipping cycles, the working frequency be reduced to less than 20KHZ. This Sometimes a noise audible to human ears is produced. The size of this noise is also related to the production process of the transformer. Since the winding and paint impregnation of each transformer's coil are slightly different, the noise of each product's operation is slightly different. There is a loud sound when the fan is running; when the ambient temperature is high, the fan may work even if it is unloaded. These are normal phenomena. It is recommended to turn off the AC switch when the product is not in use! If you mind it, please do not buy it NOTE2: 1500W PSU is 1500W under 220V AC input, it can let RD6030 output 1440W max, but it is only 1200W under 110V AC input, it can only let RD6030 output 1140W max, please be careful when choosing PSU Operation and Test 1.RD6030 actual test: output voltage and current accuracy and load regulation 2.RD6030 actual test: output curve no overshoot when power on, output, cut off Input 3.input voltage protection "RD6030 EU set 1440W" option is RD6030 assembled set with 230V EU plug AC power cord, the max output power is 1440W max, so it cannot output 60V 30A at the same time, it is RU warehouse stock so only RU area customer can make the order, you can also in this link Colour:White Material:ABS Package Contents: 1 x CNC DC regulated power supply Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.