Thanks Terry_P. I have looked on the forum you suggested. Very interesting. My alerts did actually start but then was alerting showing Mr Nobody all the time. People coming through the outer porch door are already through the inner door before being activated therefore showing Mr Nobody again. I actually call it Dozy Dog. I have explained all this to the supplier of mine and he has asked me to send it back for a replacement. Having read so many other people problems I feel it is a general problem with all of them so am not going to bother.