The NuPower™ Fan-Cooled Heatsink is an optional accessory item compatible with NuPower Xtender™ Series Bidirectional Amplifiers.  This accessory can be purchased individually, or as a part of the NuPower Xtender™ Accessory Kit which also includes the NuPower Xtender™ Upgraded Cable Interface Assembly – Banana Plug Termination.