They work reliably and loud enough. We're using it for a classroom game show and the students really love it. Each buzzer runs on 2 AA batteries, but you need a tiny Phillips screwdriver to open the battery compartment (here's the one I bought: https://www.amazon.com/gp/product/B0058ECGN2/ref= oh_aui_detailpage_o08_s00?ie =UTF8&psc=1 ). It's interesting to squeeze one when people sit down.
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