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Black USB step-up cable adapter, 104cm long with red and black leads

Ruth's sister

Ruth's sister USB 5V to 3V Step-Up Cable Adapter 104cm

SKU CH-7KK9-XYCQ5

Converts USB 5V input to 3V DC output, replacing two AA or AAA batteries for compatible low-voltage devices

  • Replaces two AA or AAA cells with a single USB feed
  • 104 cm cable reaches devices across a desk or dashboard
  • Delivers up to 1 A at 3 V from any 5 V 2 A USB source
  • Black and red leads make polarity identification instant
  • Works with radios, toys, LED lights, clocks and other 3 V gear

USB step-up adapter for 3 V devices

This cable adapter converts a standard USB 5 V source into a 3 V DC output with a maximum current of 1 A. It replaces two AA or AAA cells in radios, toys, LED lights, clocks, calculators and similar low-voltage equipment. The 104 cm lead provides flexible placement around a desk or bench.

Integrates with any USB power source

Connect the USB-A plug to a charger, power bank or car adapter to feed the red and black flying leads. No batteries are required, freeing up cell compartments and removing the need for periodic replacement. Polarity is fixed with red positive and black negative for straightforward wiring.

Passive conversion with minimal heat

The step-up circuit draws up to 2 A at 5 V input and delivers up to 1 A at 3 V output without active cooling. In normal use the cable runs cool and silent, adding negligible load to the host USB port. It is not suitable for charging applications.

Highlights

  • Replaces two AA or AAA cells with a single USB feed
  • 104 cm cable reaches devices across a desk or dashboard
  • Delivers up to 1 A at 3 V from any 5 V 2 A USB source
  • Black and red leads make polarity identification instant
  • Works with radios, toys, LED lights, clocks and other 3 V gear

Specifications

No published specifications for this item yet.

Questions about this item

What is the maximum current the 3 V output can supply continuously?

The adapter is rated for a maximum output of 1 A at 3 V DC, so sustained loads should stay at or below that figure.

Does the cable generate noticeable heat or noise when left plugged in all day?

The unit has no fan or moving parts and is a simple step-up converter, so it runs silently and produces only minimal warmth under normal load.

Which USB power sources can I use with this adapter?

Any standard USB port or charger that can deliver 5 V at up to 2 A — such as a wall adapter, car charger or power bank — will power the cable.

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