EnergySenseï؟½ insulated walls and cover are up to 40% more energy efficient than similar inflatable hot tubs. Compatible with the Bestway SmartSpaï؟½ App that allows you to control the temperature, timer, filter and massage system from the palm of your hand. MaxHoldï؟½ fabric internal beams provide superior air pressure retention, stability and lightweight portability. Freeze Shieldï؟½ automatic heating function protects pump and liner from damage due to cold weather. Power Saving Timer allows you to control the temperature of your hot tub up to 40 days in advance.Fast and easy setup using the included spa pump. Water Capacity: 1,180 L (312 gal.)