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From the Manufacturer; With this apparatus, you can hear sounds that you would not normally hear. You can hear the sounds of the microscopic world - such as an ant s footsteps. You can also conduct other sound experiments. Science guide included (68 color pages).Treasure seekers, begin your quest for valuables armed with this lightweight metal detector. This silver-and-red metal detector extends from 24.5 inches to 39 inches long and features a sensor ring that folds and swivels for easy storage. Insert a 9-volt battery (not included), adjust the unit for your height, and sweep over the ground to detect forgotten treasures. Coins, keys, and even rings register with a beep and a flashing red light. Whether it s the thrill of discovery or the promise of riches soon to be discovered, this metal detector is sure to please. --Tami Horiuchi