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MS Shockwave and Toon Soundwave a friendly anon sold me arrived today. No knee issue with my Shockwave, thankfully. However, keep in mind that the thin rubber hose they included with our logical boi gets squeezed by the optional kibble concealer backpack piece, which doesn't sound feasable for long-term display. As a workaround I taped the hose to the back of that piece. Also, you have to manually disconnect the battery to make it shut off. I worry about breaking that, because it's a long thin tube, rather than a button cell.