Frog Mug with Ribbit Sound, Cup Ribbits When Lifted, Ceramic, 3.75-inch Make your daily cup of coffee a fun experience for all Measures about 3.75" tall, 3.5" wide, 5.5" long (inches) Made of ceramic, Do Not Microwave, Hand Wash Only Has a light sensor built into the bottom of the mug that is sealed and looks like a regular white bottom of a mug Sound is activated when the mug is lifted off of a flat surface, such as a table or counter