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secondhand Modem cooling device and other devices new

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Cooling device of the modem or other device

Cooling of the modem or other device, e.g., some transistor linear, operates with power from a USB port or an external source with a working voltage of 5V. Very practical because the receiving space of the device can be adjusted so that the side fins embrace the device to be cooled, as shown in the photo. The device is unused in its box.