Finally some good will come out of all that walking, biking and hiking you've been guilted into. All that movement can charge your phone.

More than two years after the nPower PEG arrived on the scene with promises of kinetic charging for our devices, it's finally available for purchase.

The nPower PEG (personal energy generator) contains a weight, springs, an inductive coil and a battery. As you move, the weight moves up and down and generates energy that is stored in the internal battery. The more you move, the more energy is created. After you've gone for your evening jog or hiked up a mountain, you can unleash the stored electricity via the USB 2.0 port. Tremont Electric ships the charger with a USB cable and micro USB adaptor. iPhone and iPod users will need to purchase an additional adaptor

Just don't try to charge your laptop. The company notes that laptops require more power than the nPower PEG generates. Tablets like the iPad can be charged, but only to about 15 percent.

Still, it's pretty useful for all those other gadgets in your backpack or purse. If you're wondering how far you'd have to walk to call your mom, Tremont Electric has a handy guide:

1 minute of walking = 1 minute of listening on an iPod Nano

11 minutes of walking = 1 minute of talk time during a 2G call on an iPhone

26 minutes of walking = 1 minute of talk time during a 3G call on an iPhone

The 10.5-inch tall nPower PEG cylinder is available for purchase at REI for $200.