Some program versions may have this problem. Please upgrade your system. Alarm function is null. Alarm setup is not correct. Alarm cable connection is not correct. Alarm input signal is not correct. There are two loops connect to one alarm device. ...
It is 100% original from DH, so please don't worry any quality problem.2. Please DO NOT update this camera!3.Since some special reason, our store will stop useingall logo on the products. and you will not see any image with the logo. But the products you buy still with be provide...