Includes: - 1 FROG @ease Floating Sanitizing System (the blue top) - 2 brand-new sealed FROG @ease SmartChlor Cartridges - @ease smartchlor test strips - original box and instructions From Amazon: The FROG @ease Floating Sanitizing System combines sanitizing minerals and SmartChlor Technology to kill bacteria two ways with up to 75% less chlorine. The result is Fresh Mineral Water that’s silky soft with far less odors and the easiest water to maintain because it’s self-regulating. It knows when more sanitizing power is needed and automatically delivers it. You sit back and relax until FROG @ease flips over. Then simply replace the SmartChlor Cartridge for another 3-4 weeks of worry-free hot tub enjoyment! With FROG @ease, there's no constant monitoring or mixing chemicals. You shock only once a month and it's easy on hot tub surfaces with no smelly odors. Features & details: - For any hot tub up to 600 gallons - Kills bacteria with minerals and SmartChlor - Self-regulating for continuous crystal clear water - Pre-filled cartridges for no mess, no guess, no stress!