Great power bank..Can charge 2 phones at a time. IPRO is promising to provide 10,400mAH capacity cells inside the power bank guaranteed and looks like they kept the promise as this power bank has 10,400mAH battery capacity and gives 7,000mAH output, which is around 70% conversion rate, which can be consider decent from midrange power bank, as no power bank on the earth provides hundred percent conversion rate (some power gets wasted during power transfer)One thing to note that, this power bank does not support quick charging, which will not be a concern if your phone does not support quick charging. It also has a LED torch, which is not so bright but will help in emergency. You can turn the torch on or off by simply long pressing the power button. It comes with one year manufacturer warranty