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Do the CS50 and the CS55 have the same Replacement Headset?

NO! They are not interchangeable!

The CS50 (DISCONTINUED!) Replacement mic is a longer mic.

The PN 64402-11

This product is DISCONTINUED and we do not carry it!

The CS55 (DISCONTINUED!) replacement mic is a shorter mic.

The PN 72195-01

This product is DISCONTINUED and we do not carry it!

They have different headsets because they run on different frequencies.