HAME QC2 20000mAh Quick Charge Polymer Power Bank with Built-in Cable, High Capacity Portable Charger for IPhone, IPad, Android Smart Phone and More.(New Version) Li-polymer battery, offer safer charging experience. Built-in charging cable for output or input. High capacity of charging 3 devices simultaneously. Overvoltage protection, overcharge/overdischarge protection. Warranty:1-year limited warranty