* inside and outside in 18/8 quality stainless steel. This is rust proof.
*Electronic Travel Car Mug Warmer General Features
*you can also enjoy in the cold season warm your coffee.
*Material: Inner outer Stainless steel.
*With this electric Isolierbecher they can make your coffee / tea always warm.
* USB function only for keeping warm, no heating
* Wash inside out with mild detergent. Use a brush for cleaning the inside. Do not use strong detergents,
bleach or cleansers containing chlorine.
* When not in use keep the mug lid open to avoid odour.