This rechargeable mobile power bank's four lithium ion batteries combine for a massive 12,000mAh of backup power for your mobile phone, tablet or other digital device. Convenient 2-port 1A/2.4A design allows dual charging with your devices' USB charging cables. Unit features digital charge level display, power on/off button and includes a USB cable to charge the power bank. This product has undergone the most rigorous testing in the industry and is SGS Q, BC (California Energy Commission), CE / IECEE and FCC VOC certified.