Based on your listing screen, here are the exact values to fill in so buyers filtering search results can easily find your item:
Brand: SalonDepot (Make sure to update this from "Does not apply")
Type: UV Sanitizer Cabinet
Model: JY-520
MPN: JY-520
UPC: 711181369892
Suitable For: Tools, Manicure Set, Smartphones
Features: UV Light Disinfection, 8L Capacity
Color: Black
Your draft currently has the estimated package dimensions set to 18" x 14" x 12" and the weight set to 9 lbs.
Since the unit itself is 6 lbs and measures roughly 12" x 9" x 10", your package settings leave a good amount of room for protective bubble wrap and box padding. This looks perfectly calculated to ensure safe transit via USPS Ground Advantage without triggering unexpected oversize or overweight carrier adjustments later.