AC power adaptor is optional. Eggspert light/buzzer main unit also runs on 4 AA batteries.
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We were looking for an inexpensive way to enhance participation during live training sessions. The Eggspert is a great tool to use during games or to get participants to answer quesions. We have used this in 5 different live sessions within our company so far and both the participants and trainers have been pleased. A great value for your money!