In hubsell there are following levels of feature access:
observer - this basically means a user can observe the activities like campaigns, sourcing, etc. Following are the limitation of an observer account:
no email sending
no social connections
no campaign creation / editing
no admin access
admin user - any user can be given the admin account rights, which will provide that user access to:
integrations
team management
credits usage overview and
suppression management
Please note: The number of observers is limited to two per company