Those looks you're getting, it's not you, it's your Power Pack. Charge your mobile device with a fun, completely custom Power Pack that'll get noticed. Our Power Pack X400 can charge any phone or tablet to keep you productive throughout the day. The 2200 mAh internal battery is generally considered as the minimum battery size to charge iPhones & Android Smartphones from Samsung, Motorola, HTC, Nokia & others with the included Micro USB input cord. To recharge, simply plug it into your computer.