Double walled tumbler,Walls help keep your drink cool and your hands dry,Includes red twist-off lid and drinking straw,Holds up to 530 ml. (18 oz.),BPA free and FDA compliant,Red flashing LED lights,On/off button on the bottom,Battery operated – 3 lr41 batteries included/inserted,A brand new product for the holidays and unique to Debco,Stock is limited so make sure you order early,Hand wash only (remove light mechanism before washing),Acrylic