The tuner does not have a secure button battery compartment that is resistant to being opened by children, or a warning that it contains a battery button.
Consumers may be unaware that the tuner contains a button battery. Button batteries pose a hazard to young children, who may suffer injuries if they gain access to button batteries and ingest them.
What to do...
Stop using the affected tuner and keep out of reach of children. Contact the supplier, Direct Imports (NZ) Ltd, with your receipt of purchase from Costco NZ, to arrange a free equivalent replacement Fender Tuner.