vivo 4dA brief overview of the Osaki Ai Vivo 4D Massage Chair. Prepare to be captivated by the Osaki OS-Ai Vivo 4D + 2D Massage Chair – a pinnacle of massage chair technology. As part of Osaki's Ai series, it incorporates dual-track technology,vivo Y04 Android smartphone. Announced Feb 2025. Features 6.74″ display, Unisoc T7225 chipset, 5500 mAh battery, 256 GB storage, 4 GB RAM, MIL-STD-810H pliant.