A stethoscope designed for the hard of hearing user. The E-Scope II utilizes modern electronic circuitry to amplify heart, breath and Korotkoff sounds so they are much easier to hear. 64 gain positions. Up to 30 times louder than acoustic stethoscopes. All controls are on the head (heart and breath frequency selector, volume control, on/off). Automatic shut off after 2 minutes to conserve battery life. Maximum SPL output of 120 dB. Adult, pediatric and infant plastic bells, pediatric diaphragm, adult Specialist diaphragm, and three styles of ear tips are included. Powered by one AAA battery, six months of use. One year warranty. Lifetime technical support.