The EarCheck Monitor accurately detects the presence of middle ear fluid (i.e. otitis media with effusion) which may be associated with acute ear infection. It is clinically proven to be safe and reliable and provides accurate results in seconds. The EarCheck Monitor for home use is based on the same technology available for doctor's offices. This technology uses sound waves to detect middle ear fluid. The EarCheck Monitor sends a pleasant chirping sound into the ear canal. Some of this sound bounces off the eardrum and travels back to the instrument's built-in microphone. Sophisticated electronics inside the monitor analyze the reflected sound to determine if the eardrum is working normally. If there is fluid in the ear, the eardrum's vibrations may be restricted. The more fluid present, the greater the reflected sound. The procedure is quick and painless. Within seconds, you will be able to determine if your child has fluid in the middle ear. The EarCheck Monitor displays the results in a way that is easy for you to interpret and can assist you in determining when to seek medical attention.