Power switch button/keycap
Blue plastic On / Off button.
HP Power switch button/keycap, DesignJet 430, DesignJet 450C, DesignJet 455CA, DesignJet 488CA
HP Power switch button/keycap. Technical features: DesignJet 430, DesignJet 450C, DesignJet 455CA, DesignJet 488CA