Is my appliance dual voltage rated?
To check if you need to use a converter or transformer, look for the appliance rating plate.
A dual voltage rated appliance will display (for example) ‘INPUT: 110-240V’ on the body of the appliance or its power supply.
This means the appliance can work with any supply between 110V and 240V.
As Ecuador operates on a 120V supply voltage, this means you don't need a converter or transformer for this appliance, just a travel adaptor.

Is my appliance single voltage rated?
If your appliance or its power supply are not dual voltage rated, it is a single voltage appliance.
In Ecuador the supply voltage is 120V.
Therefore, unless unless the appliance operates at 120V, you will need a voltage transformer or converter for the appliance to work safely and properly.
Converters and transformers are similar but converters are typically used with appliances that operate for a short duration (1-2 hours) while most transformers can be used with appliances that operate continuously.
Also, be aware that some travel adaptors are not suitable for appliances which need an earth connection. Only use these travel adaptors with double insulated equipment which will be clearly marked with the symbol shown below.