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The sensor is shaped like a hockey puck but has smooth rounded edges and a glossy white finish. It's 1.5 inches high and 2.7 inches wide and has three telescoping electrodes and a speaker on its base.

The sensor is shaped like a hockey puck but has smooth rounded edges and a glossy white finish. It's 1.5 inches high and 2.7 inches wide and has three telescoping electrodes and a speaker on its base.