"My customers can't hear me!"

This is a very common issue and typically it's a very easy one to address:

-Most people may think the optimal position to wear your drive-thru mic is directly in front of your mouth. Although, the best place to wear your drive-thru headset mic is actually at your chin. This will get rid of any static or interfering noise that could be caused from speaking too closely into the drive-thru headset mic. Definitely do not wear the drive-thru headset mic at your forehead or beneath your chin.

-Always remember to remove the foam protector from the mic and confirm that the mic hole is fully clear. Sometimes this small hole will get clogged with debris and causes volume issues or "muffled" sounds.

-Replace the drive-thru headset mic foams regularly.  They should be in place to protect the mic area, and replaced regularly for sanitary reasons.

-If you use corded drive-thru headsets (as opposed to all-in-one), make sure that your connection to the drive-thru belt pack is free of debris and is very snug.  If some of your drive-thru headsets work better than others, then swap drive-thru headsets and drive-thru belt packs to deduce which drive-thru headsets or drive-thru belt packs are causing the problem.  Get the faulty ones repaired now to avoid running out of working drive-thru equipment at a critical time.

-Go outside to your order point and confirm that nothing (like a point-of-purchase sign) is obstructing your customers from the outside speaker or mic.

If you check off each of the items above but still have issues with less than clear sound to your customers, then you probably have a speaker or wiring issue.  Call in your local service company (CE can recommend one in your area if you like).  A relatively small investment will make for some much happier customers and you as well!