Oblivion? This small key chain power bank will help you out of some jams

Tau in person's hand on brown background.

Adrian Kingsley-Hughes/ZDNET

what Ms?

Made by Rolling Square — a very cool company Incharge X, 6-in-1 charging cable — Tau is designed to charge your smartphone and keep your keys in one place.

The Tau is a small power bank key fob that magnetically attaches to a wall-mounted charger. In the morning, grab your keys with a fully charged power bank. When you come back in the evening, pop your keys back into the holder and charge the power bank.

This way, you know where your keys are and you always have a charged power bank.

Further: 5 Best Portable Power Banks

Oh, and the power bank has built-in USB-C, a Lightning cable, and a MicroUSB cable, so you don’t have to remember to bring separate cables.

Rolling Square Tow Technical Specifications


  • Lightning (iPhone, iPad, iPod, AirPods)
  • USB-C devices
  • microUSB devices


  • Size: 60 x 45 x 12 mm / 2.32 x 1.77 x 0.47 inch
  • Weight: 40g / 1.4oz
  • Capacity: 1400 mAh
  • Weight: 350 g / 12 oz

in the box

  • Dow Power Bank
  • Tau Dock and USB Power Cable
  • Screws and wall plugs
  • Nano absorbent double sided layer
  • User manual
  • Eco-friendly packaging

Further: This compact USB-C charger packs a punch

Tau cluster on brown background.

Adrian Kingsley-Hughes/ZDNET

According to Rolling Square, Dow is the smallest power bank in the world. I can’t confirm this, but it’s definitely smaller, lighter, and no bigger than a car key fob.

A 1400mAh battery might not be enough to fully charge a modern smartphone, and 1A charging power isn’t fast, but it can get you out of a low-battery jam.

Model, input, output and capacity information for Tau

Adrian Kingsley-Hughes/ZDNET

The bottom of the key fob has a magnetic charging port that connects to the dock. The dock can be attached to a wall using the provided screws of the nano absorbent pad.

A close-up of Dow's magnetic charging port

Adrian Kingsley-Hughes/ZDNET

On the other end are two charging cables, one for USB-C, the other for Lightning and MicroUSB.

A close-up of Dow's charging cables

Adrian Kingsley-Hughes/ZDNET

Further: Fake Lightning cables can damage your iPhone. Here’s how to make sure yours is real

Here is the fob on the charging dock, with the dock charging cable attached. This is a neat collection.

Tau on a brown background in a dock with keys attached

Dock in dock with keys attached… ready for action.

Adrian Kingsley-Hughes/ZDNET

Dow Everything I’ve come to expect from Rolling Square — a quality product that solves a real problem. A small power bank masquerading as a key fob and a well-equipped charging dock make this a useful tool that can be considered a gimmick.

Perfect for those who forget where they put their keys and leave home in the morning with a nearly dead smartphone.

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