Banana Boat Bruno moves and sings "Banana Boat (Day O)". He has been adapted to accept a standard 3.5mm switch (sold separately) so people with limited hand function can make him play and sing. Press and release your switch or the button on his hand to hear him sing. This silly monkey is great for teaching cause and effect, enhancing language skills, providing auditory and visual stimulation and encouraging movement. Marvin measures 10" tall and is unbelievably adorable and soft! 2 AA batteries included.