... happy birthday...Lightweight & portable, easy to carry, and easy to use.With a clip, could be ... Power Switch to turn ON/OFF.Produce happiness and surprise with this magic item on Christmas, ... , etc.Also a good instrument to learn and practise music playing.Specifications:Controller size: 3.59 ... : Tone, Stop, Demo, Rhythm, Tempo, VolumePower supply: 4 x AAA batteries (not included)Package size: 24 * 19 * ...