Features our patented mulit-frequency ``Ring-O-Raised`` diaphragm system, ``E-Z Grasp`` designed, chrome plated chestpiece with ``Ultraflex`` lite binaural tubing assembly with color coordinated reta

Same features as CK-638P, except that it is of ``Duracote`` Matte Satin finish.

Identical features as CK-638P only in Matte Gold plated finish.

Features our patented mulit-frequency ``Ring-O-Raised`` diaphragm system, ``E-Z Grasp`` designed, chrome plated chestpiece with ``Ultraflex`` lite binaural tubing assembly with color coordinated reta

Same as CK-M600P only in Matte Gold plated finish.

Same as CK-M600P only in ``Duracote`` Matte Satin finish.

Features our patented multi-frequency ``Ring-O-Raised`` diaphragm system, ``E-Z Grasp`` designed, chrome plated chestpiece with ``Superflex`` inner spring binaural and 1 piece molded PVC Tubing.

Same as CK-M600P only in Matte Gold plated finish.

Same as CK-M600P only in ``Duracote`` Matte Satin finish.