Ship the wrong voltage and the unit won't start or burns out. Your markets run 220-240V/50Hz — but Japan, Taiwan, parts of the Americas run 110-120V. Send 220V there = dead stock.
Do this
Name voltage/frequency on the PO. Uniform 220-240V/50Hz to lock it. Mixed/110V to wide-voltage (100-240V) or dedicated 110V build.
Not sure which voltage your market needs?
Name your destination countries and we'll lock the correct voltage/frequency — or spec a wide-voltage (100-240V) unit that covers mixed markets.