Always keep safety front and center. Ensure every device you stock meets the legal requirements in your region—age verification, warning labels, and child-resistant packaging are non-negotiable. If a device fails a compliance check, it's not just a bad buy; it's a liability. When in doubt, consult official sources like the FDA or your local regulatory body. And remember, never modify a device to 'fix' a performance issue—that's a safety risk and likely voids warranties. Stick to proven fixes and transparent communication with your customers.