Check the listing for details. MAXTENS 1000 Analog TENS Unit includes Lead Wires 4 Electrodes & 9 volt battery. Condition: New with box. Listed at 49.93 USD. Over the Counter No Prescription Needed ---User-driven units feature a wide array of output combinations to help ensure proper settings. ---Features 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. ---Sturdy construction with an attractive appearance. ---Protective cover to guard against accidental setting changes. ---Zero Start feature for shock prevention- if the output is not set to "0" while the battery is being connected, unit will not operate. ---Amplitude is adjustable, 0- 80mA peak into 500-ohm load each channel. ---Waveform is asymmetrical biphasic pulse. Analog. Pulse rate is adjustable, 2 Hz ~ 150 Hz.