40? MAXIMUM HEAT: Even if it's cold outside, your body will keep heated and warm with our inflatable hot tubs - great for extending your evening times outdoors. Heats between 1-2? per hour for a gently build up. Do not use in temperatures below 4?.SURROUNDING JETS: Plenty of water outlets to surround everyone with soothing and gentle massaging bubbles - keeping you relaxed and happy as you enjoy your garden/outdoor space.FOUR-SIX PEOPLE SIZE: The blow up hot tub is perfect for use everyday with the family or hosting your own pool party this summer and beyond.LCD DISPLAY: Easy to control and change the settings - at the tip of your finger. Great for when you are relaxing in the portable hot tub.INFLATABLE SPA TUB: Simply connect the included external pump, inflate, fill with water and go. Deflates and folds away easily too.