655 features:
Diaphragm only type chestpiece fabricated from lightweight acrylic provides up to twice the amplification of conventional acoustic scopes; no electronics to malfunction, no batteries to wear out; weighs little more than a conventional scope; stainless steel binaurals with double leaf internal spring fixed at 15° angle for greater comfort;reinforced flexible 22" PVC "Y" tubing yoke

• 12 colors