The ExerSwim” portable swim current generator from Master Spas, Inc. is a solid, self-contained, rechargeable unit that quickly installs without special tools, plumbing or electrical work. The system operates on safe, low-voltage batteries that fully recharge in only a few hours. Current is controlled by a patented propeller drive and features a dial system to select the right speed. Approximately three feet high by two feet wide and weighing 55 pounds (without batteries), the unit requires deck space of less than two square feet. The battery box stands one-foot tall on the deck.www.masterspas.comcustomerservice@masterspas.com