Pricing is per-station. Adding additional stations is supported, but requires an additional subscription per-station. Before the end of your 30-day trial period, you will need to add a payment method to your account to continue using premium features. After your trial is over, and for every week you have an active account, you will be charged the weekly rate regardless of usage. Sign up, management of your subscription, and cancellation is all self-service and you are free to adjust your subscription at any time without needing to talk to anyone.