12V PC Fan Speed Controller 3Pin/4Pin with Fan Splitter Cable AC 110V-240V to DC 5-12V Adjustable Adapter FC 36W 3A (FC-3/4P
Condition: New
Buy Now, Pay Later
As low as
$3
/ mo
Learn more
- – 4-month term
- – No impact on credit
- – Instant approval decision
- – Secure and straightforward checkout
Ready to go? Add this product to your cart and select a plan during checkout.
Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.
Learn more about financing & leasing here.
Free shipping on this product
Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Thursday, Dec 18
Recently Viewed
Features
- Multiple applicationsDIY PC assembly: Solve the problem of insufficient fan interfaces on the motherboard and customize personalized air ducts. Servers/workstations: Centrally manage multiple fans to improve heat dissipation efficiency. Industrial equipment: Control ventilation and heat dissipation in equipment such as cabinets and electrical control boxes.
- Variable controlThe fan's variable speed settings | Input : AC 100V - 240V 50/60HZ | Output: 4V 12V 3A | Max Power:36w | Plug-and-Play, Easy Installation
- Reliable & RobustCapable of driving up to four fans simultaneously with a total output of 36W. Effective heat dissipation and consistent performance during extended operation.
- PlugandPlayPowered by a standard AC plug (100240V); no settings or internal wiring needed. Simply connect, adjust the knob, and experience instant cooling.
- Technology & SupportWe aim to provide quality products and services, if you have any questions, please feel free to talk to us, we will reply as soon as possible and solve the problem for you
Brand: WDERAIR
Number of Items: 1
Material: Plastic
Manufacturer: WDERAIR
Package Dimensions: 1.5 x 1.5 x 1 inches
Item Weight: 8.8 ounces
Date First Available: August 26, 2025
Manufacturer: WDERAIR
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Thursday, Dec 18
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
- Klarna Financing
- Affirm Pay in 4
- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
Top Amazon Reviews
This thing is cheap in both price and construction, but it does the job. It's basically a wall wart but with a control circuit in it. It's likely a PWM signal that changes the duty cycle to make it go from 5-12 volts. To be clear, it does not do PWM signalling out for fans. This is purely a DC voltage control. That being said, this thing has way more uses than JUST fan control. The DC out is actually a barrel plug that the fan headers split from. You could easily plug a compatible barrel jack into the output and DC control an RC motor or an LED strip (12v max obviously). That makes it infinitely more useful than a permanent single wire with fan terminations. The knob has a physical disconnect when turned all the way off, so there's no voltage leakage and a nice tactile click to let you know it is off. For $14, this is totally worth it.
...
show more
Reviewed in the United States on December 6, 2025 by Chris
Every tech enthusiast has a drawer full of them: perfectly good, orphaned PC fans that were replaced by quieter or more colorful upgrades. This little kit is the magical adoption agency for those fans, letting you liberate them from their computer-case prisons and put them to work on all sorts of custom projects. My plan was to build a simple ventilation system for my electronics workbench, and this kit was the brilliantly simple heart of the operation. It's a complete, no-fuss package. You get the power adapter that plugs right into the wall, the control box, and even a splitter cable to run multiple fans. It works with both 3-pin and 4-pin fans, and it just... works. I plugged in a couple of old 120mm fans, turned the dial, and was rewarded with everything from a whisper-quiet breeze to a respectable whoosh. So, what's the minor quibble keeping it from a perfect five stars? The control knob, while functional, isn't perfectly linear. The first little turn gives you a significant jump in speed, making it a bit tricky to dial in a super-low, barely-spinning RPM. It's not a deal-breaker by any means, but a little more precision at the low end would have been nice. Overall, this is a fantastic little problem-solver. For anyone looking to put some spare fans to work cooling an AV cabinet, a server rack, a 3D printer enclosure, or any other custom project, this is an excellent, four-star solution that I would happily recommend.
...
show more
Reviewed in the United States on November 14, 2025 by ScottyMac
This multi-fan power and speed controller makes a strong first impression as a simple, plug-and-play solution for anyone needing extra fan ports or precise airflow control. Setup is completely effortless—just plug it into the wall, connect up to four fans, and adjust the dial. No wiring, no BIOS settings, and no adapters needed. The controller feels solid and the variable voltage range (4V to 12V) allows for fine-tuning airflow or noise depending on the application. It’s especially useful for DIY PC builds, older motherboards with limited fan headers, and custom cooling zones in cases or server cabinets. Being able to centrally control multiple fans from one power source is extremely helpful, and the 36W total output is generous for typical 120mm and 140mm fans. Because it runs directly from AC power (100–240V), it’s also well-suited for network racks, electrical cabinets, AV enclosures, and small industrial equipment, where motherboard fan headers aren’t available. The ability to drive all four ports simultaneously without noticeable fluctuation is a good sign of stable circuitry during early testing. So far, performance matches the description: smooth variable speed control, steady output, and clean plug-and-play functionality. I’ll continue testing long-term heat performance, load stability, and noise behavior with multiple fan types and will report back if anything changes. First impressions summary: ✔ True plug-and-play operation ✔ Drives up to four fans at once (36W max) ✔ Adjustable from ultra-quiet to full power ✔ Useful for PCs, servers, cabinets, and DIY cooling projects ✔ Runs cool and stable in early use A promising little controller that solves multiple airflow and fan-power limitations with no fuss.
...
show more
Reviewed in the United States on November 15, 2025 by Quality Control Inspector #360
This is a Review of 12V PC Fan Speed Controller 3Pin/4Pin with Fan Splitter Cable AC 110V-240V to DC 5-12V Adjustable Adapter FC 36W 3A (FC-3/4P At the time of Reviewing it Price is ,14.99 With a 30% off coupon at checkout Mainly got this since i need to put some fans in my Entertainment center , since im going to be putting a HTPC in it and i dont need it cooking itself so will be adding some constant airflow to the center to keep everything happy and cool . hooked up some spare PC fans i had EK vardar 1st gen so they pull alot and blow a ton of air and with 2 of them and 2 random 140 fans i had it ran all 4 fine . Only thing to note higher power fans didnt want to spin till 50-60% of the dial turned so not sure if the low end of this controller is really working or something . but once the fans did spin i was able to lower the knob to roughly 50% and they all stayed spinning . I Do Recommend this Item
...
show more
Reviewed in the United States on November 24, 2025 by J J
This fan speed controller is excellent quality and very practical for PC setups. It smoothly converts AC 110V–240V to DC 5–12V, providing stable power for fans. The support for both 3-pin and 4-pin connectors, along with the included splitter cable, makes it versatile enough to handle multiple fans at once. The adjustable control is responsive, allowing precise tuning of fan speed to balance cooling performance and noise reduction. The 36W 3A capacity is strong enough for most desktop cooling needs, and the build feels solid and reliable. Overall, this is a 5-star product — well designed, easy to use, and a great solution for anyone looking to optimize PC airflow
...
show more
Reviewed in the United States on November 30, 2025 by Jessica Schmude