The Delta rechargeable mobile power bank's lithium ion battery gives you 2,500mAh of backup power for your mobile phone or other digital device. Use it as a wall charger and surge protector when you travel and as a power bank on the go. It offers overcharge, over current, and short circuit protection. Output is rated at 5V/1A. Unit features a unique integrated UL® Certified AC wall plug, LED capacity indicator, 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.