2-Pack 60mm Fan 60mm x 60mm x 15mm 12V DC Cooling Fan 2pin for DIY 3D Printer Extruder Humidifier

1) Is this lead wire can be reversible? How to Change the positive and negative poles ? Yes, they can be reversible. First step: Find a card pin or paper clip Second step: Push down the wire lock from the back of the terminal and pull it out. Last step: change the lead wire position, and reconnect it. Then you will get a fan with red wire(negative pole) and black wire(positive pole). 2) What is the Voltage Range? 2-1) Rated Voltage: DC5V [ Operating Voltage: 4.5V to 5.5V] 2-2) Rated Voltage: DC12V [Operating Voltage: 10.2V to 13.8V ] 2-3) Rated Voltage: DC24V [Operating Voltage: 20.4V to 27.6V ] 2-4) Rated Voltage: DC48V [ Operating Voltage: 43V to 52V] 3)What power adapter to use if I am Plugging it into a wall outlet? You need buy a Power Supply AC Adapter, Which is AC 100V-120V OR AC 100V-240V to DC Transformers. 4)How to find the correct power adapter for your electrical device? The only thing you need to know is the device’s Voltage / Volts (V) and Amperage / Amps (A), Such as this adapter is 12 Volt / 2 Amp. Make sure your device's power supply is DC 12V 2A too.