DC 5V to DC 9V USB Voltage Step Up Converter Cable hk
5v 9V升壓線
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USB 5V To 9V USB Step Up Voltage Transformer DC Power Cable 5.5mm x 2.1mm
$25.00
$25.00
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DC 5V to DC 9V USB Voltage Step Up Converter Cable

can used for powering the WiFi router via a power bank or other 5V power source during power outages. Can also be used with other devices that require a 9V power supply.