The Pisen rechargeable mobile power bank's lithium ion battery gives you 5,000mAh of backup power for your mobile phone, tablet or other digital device. The smart IC chip will switch from 1A to 2A output depending on your device's needs. Unit features a unique integrated UL® Certified AC wall plug and micro USB input for charging the power bank. This product has undergone the most rigorous testing in the industry and is UL, BC (California Energy Commission) and FCC VOC certified.