The DEEPCOOL AN400 220W CPU COOLER is an air-cooling system for CPUs, an improved version of the AN400 model. "220W" means the cooler can dissipate up to 220 watts of thermal energy, making it suitable for powerful processors. The base AN400 model is rated for 150 watts, but the 220W version likely uses a larger heatsink, possibly four heat pipes with a larger diameter, or a different design.