Tigra Sport Bike Charge Weatherproof Bicycle Power Pack with 2600mAh Li-ion Internal Battery, Black Compatible with any make/model smartphone, DIY mountable to any size bike tube Rechargeable 2600 mAh Li-ion battery doubles ANY smartphone's run time for 2X the tracking, fitness app, GPS, or other app use Silicone-covered weatherproof body protects against rain, snow, sweat, dust, or dirt 360-degree rotation, secure mounting, attach or remove in seconds, less than 5 oz (145 g) Also charges GPS, tablets, iPads, iPods, MP3, USB lights, cameras, and more