Features: brand new and high quality High quality aluminum alloy durable official cooling heatsink. With built in PWM speed-adjustable fan with elastic bracket and height-limited screws 5500 RPM high volumn air flow, fast cooling radiator 3.9X5.78CM/1.54x2.27in Compact embedded fan, Aluminum alloy enclosure With reserved silicone grease for better heat dissipation. please don'for t for touch the silicone grease when open the package. Specifications: MODULE SUPPORT : NX module POWER SUPPLY for DC 5V input STRUCTURE: Embedded fan, Aluminum alloy enclosure ELECTRICAL PARAMETER: 0.65W (5V/0.13A) CABLE LENGTH: approx 37±3mm FAN PWM Speed-adjustable: 5500±10%RPM Size: approx 3.9X5.78CM/1.54x2.27in Package Includes: 1 PC x NX-FAN-PWM 1 Set x Elastic Bracket and height-limited Screws note: There might be a bit color distortions due to different computer resolutions. There might be size errors due to different computer resolutions.