If you carry around a smartphone, you need to keep it charged. But just as importantly, you’ll often want to move stuff to and from the handset, whether it’s photos, music or just plain old data files. The choice of tools to get this done are legion, but for our money, one of the coolest and most effective gadgets you can have with you is this ChargeKey, a two-in-one data and charge cablette.

The tiny device is available in both iPhone and microUSB formats, and it’s so small and flexible that you’ll not notice it’s actually on your keychain. We’ve been carrying around the microUSB version for a while now, and it’s about as invisible as can be, until it’s needed. Which is exactly what you want a tool like this to be.

The key fits nicely into any microUSB port, which means it can charge a vast range of portable devices (and the Apple version is obviously iPhone and iPad compatible), and what’s more to the point, it works. Plug it in and you get the full capabilities of a full sized USB cable, without all the hassle of lugging one around. The product also feels nice and robust, and looks well built, which is essential if it’s going to sit alongside your keys all day.

For those without keys (really?) the company also does another product called the ChargeCard, which mimics a credit card and gives the same capability. We prefer the key version, but hey it’s a free world. Both products log in at $29 each (£22.00 in UK)