Zalman ReseratorXTBlack Hybrid Cooling System (Black) Includes Reserator XT Unit, ZM-WB5 CPU Water Block, DC Cable, Jump Cable, ZM-G300 Coolant, 4m PVC Tube, I/O Bracket, Degassing Tube, Tube Clamp, and User's Manual Active/Passive Hybrid Cooling Design - Active Cooling - 140mm Fan (Forced Convection Cooling) / Passive Cooling - Anodized Aluminum Heatsink Chassis (Natural Convection Cooling) Automatic Mode - Coolant Temperature is monitored for Automatic Control of Fan Speed and Coolant Flow Rate Manual Mode - Front Panel Control Knob allows the user to manually optimize performance and minimize noise Warning & Alarm System - Coolant Flow Monitoring warns the user when coolant flow is problematic / Coolant Level Monitoring warns the user when the coolant level is low