Layout, design and features …
Let’s look at the accessories first. Cooler Master has again included the practical RGB plug fuses.
With this you can easily secure two plugged (a)RGB connectors so that they no longer accidentally lose contact. Simple but awesome.
The aRGB controller has only one control button and underneath a “Power LED”. You will therefore probably not be able to influence the individual modes very much, you can only select one program after the other.
On the side is a combined connection for the power input and the aRGB signal to the fans. In addition, there is still the 2-pin connector to connect the reset button of the housing and thus to convert it to the RGB button, so that you do not have to open the housing every time to operate the controller.
The real heart of our 3-pack are of course the MF120 Halo fans. They have decoupling rubber elements at the corners on both sides. Each fan has a 4-pin PWM connector and two aRGB connectors.
As seen more often lately, the MF120 Halo fans are not strictly 120mm fans due to the lighting elements, but lose about 1.5cm in diameter. That may not sound like much at first, but the area of a circle increases exponentially with its diameter, so that the flow rate should be smaller compared to “real” 120mm fans with otherwise identical performance values. This can also be a significant factor for radiators in water cooling systems.
On the side, we see the eponymous additional halo rings. Compared to (a)RGB fans, which “just” shine from front and back, they promise a much nicer effect. We are excited 
Cooler Master MF120 Halo benchmarks and the practical testing …