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vivo 4dThe Osaki OS-Ai Vivo 4D + 2D Massage Chair is the newest chair in Osaki's new Ai SERIES 2025. This state-of-the-art massage chair incorporates cutting edge technology with dual4D Game Vibration 14. Realistic Vibration Feedback. 3000 mm 2. VC Liquid Cooling 15. 2000 Hz 16. Instant Touch Sampling Rate. Small Window. Gaming while Multitasking. Dual Stereo