Voltaic Systems V15 4000mah USB Battery Charger with Micro & Mini USB Adapters, White

The Voltaic Systems V15 4000 MAh USB Battery Charger with Micro & Mini USB Adapters with included battery charges efficiently from solar and stores power for use anytime. When not in the sun, it can be charged using the USB Power Cable or optional AC travel charger or DC car charger, making it just as useful on the grid as off. Charge devices from the USB Port using your own cable or the included Micro USB and Mini USB adapters.