Electric Doorbell is simple, classic, rugged, and ideal for a wide range of electricity experiments.
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The classic doorbell. Simple and rugged. Ideal for a wide range of electricity experiments. All-metal construction makes it durable for repeated student use. Requires 6 to 10 volts AC or 3 to 6 volts DC to operate. Overall size 2½" W × 5-7/8" H × 1-1/16" D.