Weight：0.4kg Size：33x 7 x 5cm 3M Littmann stethoscopes, which enable a firmer, more subtle sound, help isolate subtle sounds so you can hear the changes in your patients' most critical and challenging environments. Helps you hear hard-to-hear sounds, including autonomic cord stenosis, S3 pulsatile sounds and faint lung abnormalities. It is suitable for critical care and challenging environments such as EDs, ICUs, cardiac ICUs, dynamic environments such as emergency departments, step-down units and other walk-in units and other dynamic locations to hear subtle changes in patient status.