Replacing the Microphone renewed the DC headset- which is probably 45 years old but still works fine otherwise. Works perfectly.

I installed this on a David Clark H10-40 as part of an overall upgrade to replace the M4 electret microphone. The M4 uses a brown colored cap to boost the signal, and the M7 doesnt need the cap. Consequently replacing the M4 with the M7 will require removing foam and the speaker in the left cup to access the wiring, removing the cap and resoldering the red and white wires from the microphone boom. Performance is superb and well worth the additional effort.

As advertised. This microphone works flawlessly in a high noise environment. Great product.

One of the best investments Ive ever made. Had a dead mic on an older H10-40 and replaced with this one. 100% compatible. Mic quality is so good, this (previously inop) headset is now my primary.

DC is well know for quality and ruggedness and this mic delivers both. The two things that dropped it from a 5 to a 4 are that there was no muff included, I assumed that when you spend $70 on a new mic it would come with a muff. Secondly, the mic I received was black, I was hoping for the DC signature green like the picture. Both of these issues are minor disappointments and Im sure the mic will give me many years of service.