BEST PURCHASE EVER!
I highly recommend these buzzers - they work flawlessly and definitely add another dimension to teaching spaces - turning the mundane task of simply asking questions into a competitive arena where memory recall and reflexes combine into a super hillarious event! We specifically use these to reinforce learning and have seen the value added to our delivery and presentation. Our public quiz events have also benefitted - where groups no longer have to vie for who answered first, making the competition that more engaging. Have had no technical issues with these buzzers - other than reminding contestants and groups to leave buzzers on a flat surface in order for the buzzer to register to the controller.