Question re> VDO Z3 cycling computer !!

[Dr. Mike]

Please help ! I just got a new VDO Z3 cycling computer and continually hear the beeper while the heart monitor is on. The icon for the beeper is also on in the center bar but there is NO mention of how to turn that function OFF in the manual. Can somebody please tell me how to turn it off, it is driving me crazy.

thanks, Dr. Mike