Multiple: Sizes, ability to capture sound frequencies, ability to choose product based upon individual patient differences, ability to filter out extraneous background noises, and others.
Answered 3/19/2012
6k views
7 doctors weighed in across 2 answers
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question