This credit card size power bank is 2000 mAh, portable and perfect for promotion in business events. With grade A lithium polymer battery, built-in charging cable neatly stored away when not in use. Light and thin, convenient for traveling, camping or anywhere. Also available in 1800 mAh, 2200 mAh, 2500 mAh, 4000 mAh, 5000 mAh. Custom logo is welcomed.