Main PCB HT135 and Petra 800The HT135 PS1 Mainboard is the central control unit specifically designed for the Petra 800 Pedicure Chair, ensuring smooth operation and advanced functionality of the chair's massage and other electronic features. This high performance mainboard acts as the brain of the pedicure chair, controlling essential elements like massage functions, seat adjustments, and any integrated spa features. Features Designed for compatibility with Petra 800 & T4