The WhisperPhone is a hands-free, acoustical voice-feedback headset that enables learners to focus and hear themselves ten times more clearly as they learn by processing language aloud. Provide your students with this valuable reinforcement. Dishwasher safe. Reversible for either ear. Battery free. Ages 5+. Available in 2 sizes: Small - fits K-4 or Large - fits Gr. 5+. Please specify when ordering.