Single additional UNI FAN CL120 Wireless black fan for expanding existing clusters. Same cable-free interlocking design, 61.3 CFM airflow, 2.9 mmH₂O pressure, 1900 RPM, infinity-mirror ARGB and fluid dynamic bearing. Connects seamlessly to existing CL Wireless controller (not included with single pack). Ideal for extra intake/exhaust or push-pull radiator setups while maintaining completely clean cable management.