Bio Protech MAXTENS 1000 Analog Dual Channel TENS Unit feature a wide array of output combinations to help get the settings just right. With times ranging from 15 or 30 minutes to continuous mode, user can pick the setting that;s right for them. MAXTENS 1000 Analog TENS also feature three modes: B(Burst), N(Normal), and M(Modulation). The pulse rate, pulse width, and amplitude are adjustable to lessen acute pains due to an accident or chronic conditions such as arthritis or other joint and muscle conditions.