Notebook cooling pad + USB2.0 port hub: HNBC-3H, is used for notebook & MAC book, it is made of Aluminum. There are dual cooling fans integrated into the pad, the fan size is 70 x 70 x 10 mm (L x W x H), and the fan speed is 2500rpm max, you can adjust the fan speed according to your requirement. The fan works very quietly; its noise level is only 25dB max.There are 4 ports USB2.0 Hub built in the pad, so you can connect the any USB2.0 device outside.You can find out the power operation status From the LED indicator.

The cable of the pad can be hidden in the storage; it looks more stylish and compact.The working power supply needs Voltage: 5V±5%. You can choose the outside power for its operation also. (Power Supply: Adapter (AC 100~240V, 50~60Hz; DC 5V).The pad size is 155 x 128 x 32 mm (L x W x H).The package of accessories are consist of Power Cable & Adaptor, USB Cable, User's Manual,