2PCS DC 12V 4 Wire PWM PC CPU Fan Temperature Control Speed Controller Module CPU High-Temp Alarm

I replaced the loud, 6000rpm, always on server fans in my UPS with 4 pin pwm fans and control them with this gadget. Before I could hear the UPS from anywhere in the house. Now it is whisper quiet but will still speed up if the UPS is under heavy load. Does what it says and despite the complaints coherent English instructions are readily available online. A few things to be aware of, Fan1 is the only fan header actually temperature controlled. The other 2 are just controlled via rheostat. I use a y cable to temperature control two fans at the same time. I am not using the beeper function so cannot comment on that.

Well, it does what it's supposed to do. 5 Stars because the description is accurate. Pros- Inexpensive Cons- -Only reads temperature in Celsius -Basic functions compatible with 4 Pin Only -5amp Fan Only or buzzer rings non stop -Very Limited Range of Temperature -No LCD display -No Instructions -Cheasy probe Mostly only useful for high temperature situations.

Anyone having trouble can look at the picture I provided of the instructions I found Online for HW-585. It would help if the seller would INCLUDE These instructions.

I did test that , worked perfectly

Completely fails in driving a Noctua NF-A14 industrialPPC 3000 PWM fan The fan is well within the specs of this driver - it should work - is only 0.55A max. the board starts the fan spinning for a second, and then dies a final death. For all the outputs. Wasted a lot of time troubleshooting. total garbage.

I have noticed that the buzzer will not fit in the slot. The buzzer connector is too narrow. And the connector on the board is too wide. The pins are not aligned. Tested unit and it works well. It has been running at same speed for a few days. I need case for it. Where can I buy case? The speaker is not plugged in because the slots don match. Help!

Used these to modulate the speed of the PWM fans on my golfing partner's golf cart. Works perfectly.

Does exactly as it says. Added it to my case which has only drives in it, i.e., my own vastly cheaper disk array. Allows me to control the fans based on temps without a motherboard . Beautiful.