Associated XP ESC Fan option

Specifically for use with XP 1:10 electronic brushless speed controls, like those that come with SC10 and T4.1 RTRs, this new fan option attaches directly to the ESC’s heatsink for maximum cooling. The fan comes pre-wired with a connector that plugs directly into the ESC connector and mounting hardware is included. Any electronic component will benefit by operating at a lower temperature, which results in improved power, efficiency and reliability. Note that the B4.1 body will not fit over an ESC with the fan option installed.

Source: Associated [rc10.com]