Not tested. USB Automatic Constant Temperature Coffee Mug Warmer Cup Warmer Mug Warmer * Immediate purchase welcome, silent purchase at midnight OK ◎ * One-of-a-kind, first come, first served * Welcome bulk purchases, feel free to comment * Free shipping! ・Please understand and purchase with home storage and simple packaging for shipping (⁎ᵕᴗᵕ⁎) ・Please check the actual photos for the condition of the product♪ ※To sell as cheaply as possible, we may ship the item without the box due to shipping costs. #Click here for Kiki's product list ✨☜ 12-49