a. Fan Speed adjustable b. Two supporting angles for leisure and work c.USB Cable Storage d.Anti-slip e.USB Pass-through  FeaturesPortable & slim design, only 2.6cm.Fully covered metal mesh front panel, high cooling performance.18cm cooling fan with fan speed control button, big airflow & quiet operation.USB pass-through connector for additional USB device.Unique Anti-slip design ensures notebook safety.Technical Spec 

Overall Dimension260X350X26mm	Fan Dimension180X180X15mm	Net Weight700g	Bearing TypeHydro Bearing
Rated Voltage5VDC	Operating Voltage4.5~5VDC	Started Voltage2.8VDC	Rated Current0.12±10%~0.22±10%A
Power Input0.5~1.1W	Fan Speed600±150~1000±10%RPM	Max. Air Flow84.7CFM	Noise16~20dB(A)

Laptop cooler with fan speed adjustable for inch 15.6