These plug and go wireless foot switched offer a variety of functions, including maximum combinations of 5 functions, and up to 3 Linears and 3 switches. Multiple systems can be operating at the same time in the same room. The switches use industry standard AA Alkaline batteries and offer a typical transmitter battery life of 150-200 hours at 50-percent duty cycle. Average range for the switches is 40 feet. FDA Approved.