Powerocks says its US$34.99 Tarot is the world’s thinnest portable power bank. It’s designed to fit in a wallet, pocket, or small purse to provide an emergency charge for smartphones, tablets and other mobile devices.

It’s very useful when you’re running low on juice. the Powerock device is available for the iPhone 4S, iPhone 4, iPod, HTC, Blackberry and other smart phones.

Available in black, silver, or pink, the Tarot is about the same size as a credit card (but thicker), weighing just 1.79 ounces with measurements of 3.5 x 2.1 x 0.28. Its 1500mAh capacity gives you power to recharge smartphones and tablets with one emergency charge.

To charge your device with Tarot, just connect the included Micro USB cable from Tarot to the phone/device. For the iPhone or other devices that don’t use Micro USB, attach the device’s USB adapter to Tarot’s USB cable to charge. To recharge the Tarot after use, connect Tarot’s USB Cable to a USB computer or outlet.  Tarot’s four blue LED lights will tell you how much power is remaining, so you always know when it’s time to recharge. For more info go to www.powerocks.com .