UL-RECOGNIZED 5200mAh power bank has the capacity to charge a completely dead cell phone up to 3 times! With a 2.4A output, it is our fastest charging power bank yet! Charger includes an LED light, battery life indicator, and a recessed power on/off button. All Zing Power Banks include two Safety Valves: a Surge-Protector and a Voltage-Regulator.