About stethoscope Littmann 3000 ?

1.Would you buy a Littman 3000 or a Littmann 4100 (considering design, facilities and money) ?
2.If there is no battery inside the tube, can be sounds still be heared (without amplification or other technological trick)? I mean if the stethoscope is out the battery can be still used?
3.Is there a main difference between the sound that can be heared with a normal stethoscope and the one of an electronical steth.?
I looked on the official site but i'm afraid they just wanna sell the product, and that's why they exagerate the facilities. I don't belive every word there, so I'm curious, has anyone tried it?

As far as i know, you can use the stethoscope even with a dead battery.

The battery powered amplifier only makes the sounds louder, for easier auscultation. You really shouldn't waste your money unless you are a physician or nurse practitioner who diagnosis murmurs and other delicate cardiomyopathy's.

Nurses like me, even though I work ICU environments, don't need such sensitive equipment.

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