There are so many fitness trackers on the market that just measure your every move, motivating you to get your daily steps in to live a more active and healthy life. But this wearable uses footsteps to charge your phone's battery, giving us a new reason to keep moving.

The wearable called Ampy stores your kinetic energy for charging your phone later. After syncing devices to your phone and playing music while you work out (not to mention regular all-day use), your phone's battery may be left drained. Ampy solves this problem by using your movement to power your smartphone.

The wearable motion-charger is a small battery that can fit into your pocket, bag, or attach it to a strap to be worn on your arm while you're exercising. Weighing only as much as a phone, the device is equipped with a 1600 mAh internal lithium ion battery that can store up to a full smartphone battery charge.

Depending on your workout, one hour of exercise can generate either from one hour to four hours of battery life, or 24 hours of smartwatch battery life. Three hours of smartphone battery power gained is the equivalent to walking 10,000 steps, cycling for an hour, or going for a 30-minute run.

"We definitely see an opportunity to track a metric that means something more tangible to you," Ampy CEO Tejas Shastry told Fast Co.Exist. "It's great motivation when you get something for the work you're doing."

The device can store about a week's worth of physical activity-generated energy in its internal lithium ion battery and stays ready to use for months. To charge your smartphone or other device, plug the device into the USB port - it's designed to charge devices as fast as they would charge on a wall outlet. In a hurry or didn't work out for a few days? Users can also recharge Ampy from a wall outlet using the micro-USB port on top.

Ampy has an accompanying app, Ampy +, that shows the user how many calories were burned and the amount of clean energy that was created. It also allows you to compete with friends, but you don't need the device to use the app.

The wearable received over $300,000 in funding on Kickstarter, and is available to preorder for $99.

Photo: Ampy

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