The POOF-Slinky 016000BL Slinky Science Bionic Ear is a versatile electronic listening device that allows your child to listen to conversations or other sounds without being detected from up to 300-feet away. Look through the targeting scope of the Bionic Ear to sight your subject and then pull the trigger to amplify the sounds. The highly sensitive microphone picks up even the softest whispers through the sound cone and transmits audio through the included headphones. The microphone features an adjustable sensitivity control to eliminate unwanted background noises, such as the rumble of traffic and other random sounds that distract you from the target. Simply turn the frequency controller dial in either direction until you achieve the desired noise reduction and clearest sound. When not spying on others, this device can be used to study birdcalls, wildlife sounds and other noises that helps to hear while being undetected. The Bionic Ear includes an electronic listening device, sound shield and headphones. This device is easy to assemble and use, requires a 9-volt battery (not included) and meets or exceeds ASTM F-963 consumer safety specification for toy safety. Spies on secret missions won't miss a sound with the Bionic Ear. This is Slinky Science experiment number 181 of a series of science kits that combine the elements of learning and fun to provide hours of educational entertainment. The POOF-Slinky 016000BL Slinky Science Bionic Ear Electronic Listening Device is recommended for children 6-years of age and older. POOF-Slinky, Inc. is the maker of POOF, Slinky, Ideal and Scientific Explorer Brands. Our product lines offer new exciting play with the highly successful Sno-Toys line, Fuzzoodles activity kits, as well as timeless classics, such as the Original Slinky, Ideal table-top games, wood construction sets and over 400 other products.