It has a sound out-put jack that can be used with an optional headphone accessory: #7180405 - External Headphones for second listener (Clinical Model) or Replacement for the Hearing Impaired Belt Model. An optional stethophone may be used as well for a second listener item#718741.Sounds are up to 30x's that of acoustic stethoscopes (non electronic, non amplified units). Easy to use; Controls: volume up, volume down, selector switch for heart & lung sounds. 2 minute timer for battery conservation. Accessory pack included-(consists of 1 Pediatric Diaphragm, 3 plastic bells (adult, pediatric, infant) + 2 additonal hard plastic mushroom style ear tips). Stethoscopes now include a stainless steel adult specialist diaphragm which improves the quality of sound by 60%.Carrying case included. Operators manual and instructional CD-Rom included. 1 year mfg warranty on parts and labor. Includes 1 AAA Battery.

Product Features:
• Exceptional sound quality and filtering; including 64 gain positions and all of the stethoscope controls on the head
• Remembers the last volume setting when restarted
• 2 minute off timer - shuts off after 2 minutes of non-use to conserve battery life
• Uses an off-the-shelf AAA battery (not a hard to find watch battery)
• Has a 1year warranty and lifetime technical support