What will happen if I charge the device with over-power or lower power AC Power Adaptors?

Over-power AC Power Adaptor can be used (5V 2A or above). They are widely available in major convenience stores. Charging current will remain 5V -2A. 
Lower-power AC Power Adaptor will result in longer charging time.
Power and certification information can be checked on the packaging on the AC Power Adaptor itself. 

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