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Never be stranded with a dead tablet or smartphone battery again! With Monster PowerCard™, you always have a full charge in reserve with up to five hours of emergency power. Plus, it's so small and thin, it can easily fit in your wallet, purse, or pocket. PowerCard also charges your phone up fast—up to three times faster than standard USB chargers—thanks to exclusive Monster technology. You won't find a faster, more portable charger than PowerCard. Use PowerCard to charge any USB device, whether it's your phone, tablet, or Monster headphones.