3M Littmann 4100WS Electronic Stethoscope     
The 3M Littmann Model 4100WS electronic stethoscope replaces the popular model 4000WS. All the features, advantages, and benefits of the 4000WS model can be found on the new 4100WS, as well as 3M™ proprietary Ambient Noise Reduction (ANR) technology and Sound Analysis Software CD. 
Features 
Specially designed to pick up difficult-to-hear heart and [...]