Because USB cooling fan has low noise, you will not be disturbed when you work.It can reduce equipment working environment temperature and prolong the service life of equipment as it has great heat dissipation.Made of ABS and aluminum alloy material, it is solid and durable.There are two models for you to choose from 8cm/12cm.It is suitable for wireless router, set top box, computer case, etc.Item Name: USB Cooling FanMaterial: Aluminum Alloy,ABSColor: BlackStyle: 8cm/12cmVoltage: 5VCable Length: 1mApplication: Wireless Router, Set Top Box, Computer Case, etc.Features: Strong Wind, Low Noise, Long Service LifeSize Details: Style 8cm Size: 8cm x 8cm x 3.45cm/3.15" x 3.15" x 1.36" (Approx.)Style 12cm Size: 12cm x 12cm x 4.25cm/4.72" x 4.72" x 1.67" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x USB Cooling Fan2 x Iron Net 4 x Screws