The humble pen has long been a staple of the spy world. Hidden cameras, hidden microphones – the pen has played host to a number of distinctly un-pen-like technologies. And now there is one more to add to the list: a smartphone charger.

You need never be without power again thanks to the Power Pen. On one hand, it’s a ballpoint pen, which is always handy to have around, no matter how many digital devices you own. On the other, it’s a phone charger, hiding a small battery in its barrel. The battery won’t fully power your phone, but it will give you enough of a top up to keep you going until you can reach a proper charger. It also comes with both micro USB and lightning tips, so you can charge both Apple and Android devices. Firebox.com