Phobya - Molex adapter 4pins to 3pins 5V / 7V / 12V 30cm - Black (Electronics)
The product is useful because it allows a fan with a 3-pin molex entry with the ability to choose the 5,7,12 V voltage as the voltage the fan rotates faster, however, the focus 7V is not recommended because in case of blockage of the fan can screw up
