With the simple pull of a lever, you can play your piano silently, hearing your performance exclusively through headphones. SilentPNO dramatically reduces the sound of your acoustic piano without interfering with the normal piano action, making it ideal for silent or private piano practice sessions. When installed, a small unobtrusive knob underneath the piano keyboard is used to activate the SilentPNO function which prevents the hammers from striking the strings when the piano keys are depressed. Available for both grand pianos and upright pianos.