Riding a bike burns up a lot of energy but what if it could give you some back? Not to you but to your phone? The Siva Atom returns some of your spent energy in a form that your devices can use. It is a charger powered by your peddling.

This device attaches to your back wheel and lets you power up the battery while you travel. It can be used to then charge any device you wish, your phone, your tablet, etc. It’s great to have for people who bike on mountain trails or for long distances. It’s waterproof and can stand up to the rough and tumble lifestyle of an outdoorsman. Always have a source of power for your devices with this around.

Alternatively, the battery can also be charged via AC power or even through USB while you’re at your desk. It’s a very versatile item that adapts for your needs. So whether you’re biking through the wilderness or just surfing the dark and terrifying corners of the web, this battery pack can fit into your lifestyle. The Siva Atom is $109.99.