DURABLE CONSTRUCTION: MaxHold fabric internal beams provide superior air pressure retention, stability and lightweight portability; Tritech 3-layer external material offers superior durability and puncture resistance RELAXING MASSAGE: AirJet bubble massage, controlled through the multi-function pump, which also inflates the hot tub, controls the heat setting (up to 104ºF/40ºC), 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 4 PEOPLE: 71 in. x 26 in. (1.80 m x 66 cm) hot tub is the perfect size for up to 4 adults, with a water capacity of 177 gal. (669 L) EVERYTHING YOU NEED: Set includes 1 Coleman hot tub, 1 cover, 1 pump, 1 filter cartridge (IV), 1 ChemConnect chemical dispenser, 1 repair patch ELECTRICAL SAFETY: Do NOT use an extension cord or multi-plug adaptor; plug the hot tub directly into a grounded socket corresponding to the electrical rating of the attachment plug (110-120V AC, 60Hz, Single Phase 12A at 68ºF); Outdoor installation is preferred; Indoor installation has special requirements