Stuck on You suction power bank 2200 mAh. The 2200 mAh rechargeable lithium ion Grade A battery is enough to charge smartphones, MP3 players and more. Reusable power bank charges via USB cable (included) which can be used to recharge the battery backup or to charge up devices with a Micro USB input such as Android smartphones (Samsung, Huawei, HTC, Sony, Nokia and others). The suction pad on the back allows you to fix the power bank to your mobile device. Input: 5V/500 mA. Output: 5V/1000mA.