* Convenient one-sided chestpiece.
* New gasketed diaphragm for multi-frequency response.
* New ovoid shaped chestpiece improves ergonomics.
* Satin finish plated lightweight zinc alloy chestpiece.
* Non-chill diaphragm retaining rim.
* Adsoft deluxe PVC eartips in small and large size.
* Spare diaphragm included.
* Scope ID tag included.
* Lifetime Warranty.