400ml automatic magnetic mug mixing stainless steel coffee milk juice cup insulated stirring mix bottle drinkware features: made from food-grade stainless steel and plastic material, safe and durable. sealed mug cover, no need to worry about liquid leaking and splashing. designed with a cooling/straw hole to the cover, convenient to drink. double layer structure and magnetic device. suitable for outdoors, bars, coffee shops, homes and offices, etc. specification: drinkware type: mugs material: stainless steel & food-grade plastic color: black / white / yellow / blue / pink (optional) battery requires: 2pcs aaa battery (not included) size: approx. 13.58.56.4cm / 5.33.32.5in