Is Dahua CVR video recorder used for analog cameras? Or a mixture of 4 1?

This belongs to two in one or four in one. Two-in-one can use analog cameras and coaxial CVI cameras, and four-in-one can use analog digital CVI and AHD, which is generally universal. For example, channel 1 is analog, channel 2 should also be analog, and channel 3 and channel 4 should be consistent. Both channels that want to use analog should use coaxial HD, which is universal in two.