With 10,000 mAh, smartphones can charge up to three times so you can talk another 25 hours on the phone or surf the Internet 21 hours * The thin, lightweight Power Bank fits comfortably in a pocket or jacket pocket so your devices are always charged on the go. Two universal USB A ports have up to 2.4 A, so devices such as smart watches, fitness wristbands, headphones, speakers, action cameras and tablets can be charged quickly and safely. Since the input current is 2 A, you can quickly recharge the battery if necessary before using it again.