The collar is not responding to the handset

A. check battery status on both. If ok then:
B. check antenna on handset (remove and press trigger beside collar, collar should respond. If so antenna is damaged, order a new one from PAC.
C. collar is working ok, then make sure you are not using the handset and collar in an area with many metal buildings or metal railings are present.
D. collar is not placed snugly enough on dog. One finger should separate probes from coat. Ensure long-haired breed probes are fitted for those breeds
E. Collar needs to be reset. Touch handset contact area to collar contact area: wait for LED on collar to turn to orange. Then press trigger button, LED should flash green.