The second generation of UniFi switches brings a number of changes and improvements, the switches have been rebuilt from the ground up. Compared to the first generation, there has been a significant improvement in the air flow used for cooling, so in comparison it is up to 4x quieter* than the first generation. * at an ambient temperature of 25° and the load of the POE source at 25%, the switch is 3.6x quieter * at an ambient temperature of 25° and the load of the POE source at 50%, the switch is 4.2x quieter * at an ambient temperature of 25° and the load of the POE source at 100%, the switch