At 5 feet in diameter, the Sportster^® 140 is the perfect choice for those with space limitations, or for individuals that want a full-featured spa, at an entry-level price. Lightweight and portable, the Sportster^® 140 can easily be installed in almost any setting; indoors or outdoors. All Softub can be plugged directly into an isolated 15 Amp (115 Volt) outlet compared to others in the industry that require a 60 Amp (220/ 230 Volt) connection! We use less electricity to heat your water to your desired temperature, so you get comfort and quality at a fraction of the price!