RUITEXUN USB-DC5.5mm USB-A to DC Power Cable, 50cm, 5V
Product description
At approximately 50cm, the RUITEXUN USB-DC5.5mm cable is a short power lead for connecting a USB Type-A port to a 5V DC device with a 5.5mm x 2.1mm barrel input. Its USB-A male plug connects to a computer or mobile power source, the DC end is also male and has a positive centre pin.
It can be useful when a suitable USB port is more convenient than carrying a separate wall adapter. The connector dimensions, voltage and polarity all need to match the device, so this is a focused power cable rather than a universal charging lead.
Who it’s for
This cable is intended for someone powering a compatible 5V DC device from an available USB-A port, such as one on a desktop or laptop computer, or from mobile power. It may suit a desk setup with a nearby USB port or a portable arrangement where reducing the number of separate adapters is helpful. It suits you if your device accepts a 5.5mm outer-diameter, 2.1mm inner-diameter barrel plug and uses positive-centre power.
The key decision is whether the device’s input requirements match—not just whether the plug appears to fit. The listing identifies the output use as 5V DC, but gives no current rating. That means the information here doesn’t establish suitability for devices with higher or otherwise unspecified power demands. For those, a dedicated adapter with clearly matched electrical ratings is a more suitable approach.
What you’ll notice day to day
The short cable keeps the connection between a USB-A source and the DC input compact. In a setup where both ports are close together, it can power a compatible peripheral without adding a wall adapter to the arrangement. Its 50cm length is also a practical detail to weigh before buying: it works best when the power source can sit nearby, rather than across a room or far from the device.
This is a simple connection option, not a cable for every barrel-powered device. The 5.5mm x 2.1mm plug size and positive-centre polarity are specific requirements, and the source needs to provide USB power. Better avoided if your device needs a different voltage, connector size or polarity, or if you need a longer run. Within these limits, it offers a direct alternative to carrying a separate power adapter for a matching 5V device.
Quick overview
- Model: USB-DC5.5mm
- Cable length: Approximately 50cm
- Connectors: USB Type-A male to DC 5.5mm x 2.1mm male barrel plug
- Power use: For 5V DC devices powered through a USB port
- Polarity: Positive centre pin
- Colour: Black
- What’s included: One USB Type-A to DC power cable
Before you decide
Will it fit my device? It is listed with a 5.5mm outer and 2.1mm inner barrel plug. Check that your device uses those dimensions before choosing it.
Can I use it with any USB port? The cable is described for an available USB 2.0 port on a desktop or laptop, and for mobile power. The connected device must also be compatible with the 5V DC supply.
Does the centre pin have a specified polarity? Yes. The DC plug is described as positive-centre, so the device’s required polarity must match.
Is it worth it?
This cable makes sense when the goal is to power a known 5V device from USB-A and its barrel input matches the listed size and polarity. Its compact length can suit a close-together setup and may avoid packing a separate wall adapter. If the device’s voltage, connector details or power requirements are uncertain, a purpose-matched adapter is the safer buying direction, this listing does not provide a current rating to resolve that uncertainty.