Try a Sentry device with our 30-day risk free trial to determine if it’s right for you. Receive a full refund on your Sentry device(s) and subscription(s) within 30 days of the subscription activation date, or purchase date. All you have to do is pay for return shipping.* Refunds cannot be processed once the risk free trial is over. To cancel the continued subscription, please contact sentry_support@hellowynd.com.