Super slim 9.9mm power bank.So thin, you won't know it's in your pocket.Keep things light. The 5000mAh power bank is designed for everyday use. Stash it in your bag or pocket - it's so slim you won't even know it's there.Premium lithium-ion polymer batteriesSourced from reputable suppliers such as ATL, premium lithium-ion polymer battery cells add 5000mAh of battery life to your smartphone, tablet or digital camera.Mi Power Bank’s adopted USB smart-control and charging/discharging chips from Texas Instruments provide nine layers of circuit chip protection while enhancing efficiency.Model NDY-02-AMBattery type Lithium-ion polymer batteryInput voltage DC 5VOutputvoltage DC 5.1VInput current 2.0A(TYP)Output current 2.1A(TYP)Rated capacity 3.7V/5000mAh(TYP)Charging time 3.5 hrs with 5V/2A plug and standard cableWeight-156gTemperature ResistanceHeat-sensitive and temperature control mechanisms ensure Li-ion batteries operate within a safe range.Short-circuit protectionThe motherboard and battery are automatically protected if short circuit occurs.Reset MechanismReset the power bank if it stops responding by simply pressing the Power button.Input Over-Voltage ProtectionOVP circuit prevents voltage surges from damaging the device.Automatic Charger ProtectionDetects when the charger is inserted incorrectly and will automatically stop charging.Output Overcurrent ProtectionMonitors output current and shuts off when current exceeds the maximum limit to protect the device.Output Overvoltage ProtectionMonitors output voltage and shuts off when voltage exceeds the maximum limit to protect the device.Overcharge and Over-discharge protectionJapanese technology is used to prevent overcharging and over-discharging from damaging the Li-ion batteries.PTC Protective Circuits for the CellImported battery cells are equipped with PTC to effectively control and protect batteries when temperature and current exceed the maximum limit.Mi Power Bank automatically adjusts its output based on the connected device. It's compatible with smartphones and tablets from Mi, Apple, Samsung, HTC, Google and BlackBerry as well as a variety of digital cameras and handheld gaming devices