OS-4D Pro Ekon+ has been upgraded to an innovative advanced 4D massage chair. Experience living life better with features ranging from: Ergonomic SL Track Design, Adjustable Back Heating, True Calf Kneading, Powered Automatic and Manual Controlled Foot Rest, A Unique Side Panel Quick Control with Rotary Switch Design, Wireless Phone Charger, and Motorized Phone Holder. With 12 Unique Auto programs and 6 different Manual modes, each manual mode has an additional style to it as well.