Experiment with the science of sound using this electronic voice synthesizer, featuring 10 different voice modifiers. Side levers adjust frequency and amplitude, creating hundreds of different sound combinations. Effects include a voice amplifier and colorful flashing LEDs. A fun toy for kids and adults alike. One 9-volt battery included. Challenge your children's imaginations and keep them active with Toysmith. Committed to providing the most imaginative toys along with the highest safety standards, Toysmith has toys appropriate for all age groups.