What subscription should I choose for my Smart Dog Collar ?

The Smart Dog Collar membership is available in different payment plans:

• Month to month membership: Billed as $25 every month - 1 year commitment
  
• 1-year membership: Billed as $275 every year - Automatically renews each year
• 18 months membership: Billed as $360 every two years - Automatically renews every 18 months