I have used these buzzers for years in an engineering event with Girl Scouts and they are always dependable and loud! My only issue is occasionally they are on backorder.
This buzzer creates a very loud high pitched sound that is easy to hear when you are in another room. Constructed out of good quality material.
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I have been dealing with MCM for over 30 years now. If I didn't like the service I'd would have found a different supplier 30 years ago. For most of my needs they are the 1st stop on my shopping list.