USB output: DC5V/2.1A
Input: Micro/TYPE-C: 5V/2.0A Max
Total output: DC5V/2.1A Max
Color: black, white
Material: ABS+PC material, brushed surface texture, lithium polymer battery
Display: LED light
Features: Micro+Type C dual-port input, dual USB output, polymer lithium-ion battery, multiple security protections, meet with civil aviation standards.
Different mobile phone manufacturers use different voltages and currents for charging mobile phones. For safety reasons, a standard is needed to works with mobile phone and the charger that the mobile phone will not be damaged by a large current. This is the charging protocol. Although the charging protocols are different, but they all support the 5V/2A charging protocol.
No, regular mobile phone power bank is harmless to the mobile phone and mobile phone battery, and the mobile power supply has an intelligent charging control chip to provide better charging protection for the mobile phone.
Power banks with charging cables are better, easier to carry, and you don't need to buy an extra cables.