Hello Nanna Gee, Thank you for your wonderful review of the Sentinel system! We are happy to hear you love the value! Without you and our other customers, Defender would not be the name it is today! Amanda M. | Defender Customer Experience Supervisor

Hello Geri, Thank you for your 5-star review! We are thrilled to hear you love the product, and found it easy to install and use! Thank you for recommending it to your friends and family! Thank you for choosing Defender to protect what matters most! Amanda M. | Defender Customer Experience Expert

Hello Brian! Thank you for taking the time to review the 4K Sentinel security system. We are so glad to hear you are happy with the system. Our customer feedback is what matters most to us here at Defender! We would greatly appreciate you speaking with your friends and family about your experience with Defender and your 4K Sentinel. Thank you for choosing Defender to protect what matters most. Amanda M. | Defender Customer Experience Expert

Hello Rick, Thank you for choosing Defender. Currently, we do not offer PC viewing for the Sentinel. We are focusing on bringing you the best possible mobile viewing experience on iPhone and Android smartphone devices through our Defender apps. For the most up-to-date features and viewing capabilities please download our Defender apps available through the App Store and Google Play. Thank you for choosing Defender to protect what matters. Best Regards, Amanda M | Defender Customer Experience Expert

Hello Steven, Thank you for your review. Please reach out to our support team if you have any questions about customizing your system. Thank you for choosing Defender to protect what matters most. Best Regards, Amanda M | Defender Customer Experience Expert

Hello Roger, Thank you for your review and for being a loyal Defender customer. We are happy to hear you love the image and human detection. THello Anonymous! Thank you for taking the time to review the 4K Sentinel security system. We are so glad to hear you are happy with the system. Our customer feedback is what matters most to us here at Defender! We would greatly appreciate you speaking with your friends and family about your experience with Defender and your 4K Sentinel. Thank you for choosing Defender to protect what matters most. Amanda M. | Defender Customer Experience Supervisor

Hi Dave! We would love to help you get the most out of your 4K Sentinel Ultra HD Wired 4 Channel NVR Security System with 4 Cameras. Please make sure that sound has been enabled for each channel. We are always happy to help through live chat or email! Our customer feedback is what matters most to us here at Defender! Without you and our other customers, Defender would not be the name it is today! Yvonne M. | Defender Customer Experience Expert