EnergySense insulated walls and cover are up to 40% more energy-efficient than similar hot tubs; MaxHold fabric internal beams provide superior air pressure retention, stability and lightweight portability; Tritech 3-layer external material offers superior durability and puncture resistance CONTROL WITH YOUR SMARTPHONE: Compatible with the Bestway Connect app that allows you to control the temperature, timer, filter and AirJet massage system; Includes a multi-function pump, which also inflates the hot tub, controls the heat setting (up to 40ºC/104ºF), and runs the filtration system STAYS UP ALL YEAR LONG: Freeze Shield protects the pump and liner from damage due to cold weather; The Power-Saving Timer allows you to control the temperature of the water up to 40 days in advance PERFECT FOR 7 PEOPLE: