DW Mobile Witness™ By Digital Watchdog® Description The DW Mobile Witness™ app turns the camera on a supported smartphone or tablet into a surveillance camera that can be viewed and recorded with a DW Spectrum IPVMS or VMAX IP Plus™ NVR. Simply download the app and type in your DW Spectrum’s IP address or NVR’s IP Address/URL, port, user name and password. Now, when you press the button in the app to activate your camera and start transmitting to DW Spectrum IPVMS or VMAX IP Plus NVR. APP