LumiSpa iO: With the treatment head removed from the device, the Serial # and Lot # can be found where the treatment head attaches to the LumiSpa iO.
LumiSpa iO Treatment Head: The Serial # and Lot# can be found etched into the underside of a treatment head (the side that faces the device when attached).
LumiSpa iO Charger: The Serial # and Lot # can be found on the magnetic side of the charger (the side that attaches to the device).
