All new 40mm fan, the little vortex generator balde. The soft start circuit will help surge power that may kill the motor in extreme case. The new item is called the softcore 40, most powerful yet from WTF.
Specifications:
| Voltage | 7.2-8.4V |
| Ampere | 0.64A @8.4V |
| RPM | 14000 - 15000 @8.4V |
| Weight | 15.4g |