superk

That's a junk. 100% of Chinese brand at Aliexpress and their delivery time is too long and it is impossible to return when system broken.because shipping charge is too much from U.S.A to China.

First important thing is DVR software. Most of Chinese brand is a junk.because really hard to back up video copy and not able to see all cameras at the same time from home. TV line is not important you have to check actual pixel. 270k 470k,1300k,2100k..... I recommend sdi or ip cameras.