DC 55*21 mm Female 1 to 1 2 3 4 12V 4Pin PWM Fan Adapter Power Supply Connector Cable [product name]: DC5521 to 4Pin [Product length]: total length 35cm, main line length 20cm, branch line length 15cm1 to 1 is 30cm) Wire model: 2464 Insulation material: PVC insulation [Conductor specification]: main line 22AWG17 0.12, branch line 24AWG11 0.12 [Conductor material]: pure copper [Wire outer diameter]: main line OD4.5mm, branch line OD3.0mm Rated temperature: 80 [Wire color]: black Product weight: 23 grams [product interface]: one end of the DC5521 connector, the other four ends are the computer fan 4Pin interface [Product function]: Change the chassis computer fan to DC interface for power supply For users who choose a router cooling rack, if they already have a 12V, 9V, or 5V power supply, they can cooperate with this special adapter to supply power to the cooling rack to solve the problem of heat dissipation of network equipment. When some friends want to use an external power supply for the case fan, please choose this line. Introduce: 12V or 9V 5V1 power adapters are very common, and equipment such as surveillance cameras, routers and ADSL cats are basically used, and the choice is very large. Special Note: When the chassis fan uses an external power adapter, the lower the voltage selected, the slower the speed. If the rated voltage is exceeded, the fan will burn out, and the common fan rated voltage is 12V. One thing to understand: The power of the power supply represents the maximum power that can be continuously provided. Generally, the total power of the fan should not exceed the maximum power of the power supply (the voltage marked on the fan multiplied by the current equals the power). When the chassis fan uses an external power adapter, the selected voltage is higher. The lower the rev the slower. Exceeding the rated voltage of the fan will burn out, a common fan rated voltage is 12V. The fan interface of this line is 4Pin, which can actually be 4 lines, because only 2 lines are needed for DC power supply, so only two lines are used. Package included: 1 x Connector Cable _x000D_