Thank you for viewing. I have kept this at home for several years. I opened it once to replace the batteries and check the condition of the battery compartment (it was clean). Operation confirmed ☑️, and I have also inserted new Mitsubishi batteries. The pitch changes depending on how fast you move your hand to move the mouth. The batteries are dead. I don't think there's anything specific to mention, but I apologize if I missed anything. Please purchase only if you understand that this is a used item. It may be compressed during packaging. Thank you.