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This unit utilizes proven thermal conductivity testing method to instantly verify the authenticity of diamonds. The test results are indicated by visual light and audible beeps. Operates on alkaline (AAA) batteries (not included) or AC adapter, 120 volts, (not included). One year factory warranty. Features include: no waiting between tests, pocket size, low-battery indicator, carrying case, metal detector-intermittent beep, measured diamond-continuous beep, metal detector-intermittent beep and low battery consumption.