I have a 'Doorman' chime system (Receiver WCD813 RX) which is set to 'Ding Dong' when the doorbell is pushed. Occasionally it would chime 'Westminster chime', I think when my son activated his remote locking device on his car. I recently had to replace the batteries. Since then it seems to chime, on and off, all day.  I've had a quick look inside, but see any obvious way of changing the chimes or the frequency. Any ideas, please? Pauline  PS I've had to click on the product below, as mine doesn't seem to be listed.

Home Security - Desa International - White Wireless Plug In Door Chime