Can I remove 2 tb hdd and add 2x8tr hdd without configuring the hard drives?
yes, the NVR has 2 SATA interfaces, each one support up-10TB HDD
What is the default password of this NVR system?
The default password is 123456
Can this cameras system support audio recording?
Yes, the camera builds in microphone
Whats in the box?
A 16CH NVR with 4TB Hard Drive, 16*4K cameras, 16* CAT60, 16 * Camera Screw Pack & Cable Waterproof Lid for Mounting,1 * 3ft Network Cable + 1 * Mouse + 1 * Quick User Guide