Surveillance-Grade Hard Drive Storage Options:4TB Listen-in audio recording will add

Listen-in audio recording will add a whole new dimension to your overall security monitoring

this powerful security camera system will help you secure the things that matter most

extending the life-cycle of the cameras

When the camera sensors detect motion

Surveillance-Grade Hard Drive Storage Options:4TB Listen-in audio recording will addTrust this massive WD Purple surveillance hard drive to record your home, office or business security footage. This surveillance HDD is ideal if you are looking to upgrade your existing hard drive or add an additional hard drive to your system. It can reliably save days, weeks, even months of HD security footage. Designed for use with either DVR or NVR security systems.